diff --git a/Userland/Applications/Calendar/CalendarWidget.cpp b/Userland/Applications/Calendar/CalendarWidget.cpp
index d771e186c6d..6674a6ef00b 100644
--- a/Userland/Applications/Calendar/CalendarWidget.cpp
+++ b/Userland/Applications/Calendar/CalendarWidget.cpp
@@ -61,15 +61,15 @@ ErrorOr<NonnullRefPtr<CalendarWidget>> CalendarWidget::create(GUI::Window* paren
 
     auto open_settings_action = TRY(widget->create_open_settings_action());
 
-    (void)TRY(toolbar->try_add_action(prev_date_action));
-    (void)TRY(toolbar->try_add_action(next_date_action));
-    TRY(toolbar->try_add_separator());
-    (void)TRY(toolbar->try_add_action(jump_to_action));
-    (void)TRY(toolbar->try_add_action(add_event_action));
-    TRY(toolbar->try_add_separator());
-    (void)TRY(toolbar->try_add_action(view_month_action));
-    (void)TRY(toolbar->try_add_action(view_year_action));
-    (void)TRY(toolbar->try_add_action(open_settings_action));
+    toolbar->add_action(prev_date_action);
+    toolbar->add_action(next_date_action);
+    toolbar->add_separator();
+    toolbar->add_action(jump_to_action);
+    toolbar->add_action(add_event_action);
+    toolbar->add_separator();
+    toolbar->add_action(view_month_action);
+    toolbar->add_action(view_year_action);
+    toolbar->add_action(open_settings_action);
 
     widget->create_on_tile_doubleclick();
 
diff --git a/Userland/Applications/FileManager/main.cpp b/Userland/Applications/FileManager/main.cpp
index f920b216ef0..cfd13d3a783 100644
--- a/Userland/Applications/FileManager/main.cpp
+++ b/Userland/Applications/FileManager/main.cpp
@@ -1079,31 +1079,31 @@ ErrorOr<int> run_in_windowed_mode(DeprecatedString const& initial_location, Depr
     help_menu->add_action(GUI::CommonActions::make_command_palette_action(window));
     help_menu->add_action(GUI::CommonActions::make_about_action("File Manager"sv, GUI::Icon::default_icon("app-file-manager"sv), window));
 
-    (void)TRY(main_toolbar.try_add_action(go_back_action));
-    (void)TRY(main_toolbar.try_add_action(go_forward_action));
-    (void)TRY(main_toolbar.try_add_action(open_parent_directory_action));
-    (void)TRY(main_toolbar.try_add_action(go_home_action));
+    main_toolbar.add_action(go_back_action);
+    main_toolbar.add_action(go_forward_action);
+    main_toolbar.add_action(open_parent_directory_action);
+    main_toolbar.add_action(go_home_action);
 
-    TRY(main_toolbar.try_add_separator());
-    (void)TRY(main_toolbar.try_add_action(directory_view->open_terminal_action()));
+    main_toolbar.add_separator();
+    main_toolbar.add_action(directory_view->open_terminal_action());
 
-    TRY(main_toolbar.try_add_separator());
-    (void)TRY(main_toolbar.try_add_action(mkdir_action));
-    (void)TRY(main_toolbar.try_add_action(touch_action));
-    TRY(main_toolbar.try_add_separator());
+    main_toolbar.add_separator();
+    main_toolbar.add_action(mkdir_action);
+    main_toolbar.add_action(touch_action);
+    main_toolbar.add_separator();
 
-    (void)TRY(main_toolbar.try_add_action(focus_dependent_delete_action));
-    (void)TRY(main_toolbar.try_add_action(directory_view->rename_action()));
+    main_toolbar.add_action(focus_dependent_delete_action);
+    main_toolbar.add_action(directory_view->rename_action());
 
-    TRY(main_toolbar.try_add_separator());
-    (void)TRY(main_toolbar.try_add_action(cut_action));
-    (void)TRY(main_toolbar.try_add_action(copy_action));
-    (void)TRY(main_toolbar.try_add_action(paste_action));
+    main_toolbar.add_separator();
+    main_toolbar.add_action(cut_action);
+    main_toolbar.add_action(copy_action);
+    main_toolbar.add_action(paste_action);
 
-    TRY(main_toolbar.try_add_separator());
-    (void)TRY(main_toolbar.try_add_action(directory_view->view_as_icons_action()));
-    (void)TRY(main_toolbar.try_add_action(directory_view->view_as_table_action()));
-    (void)TRY(main_toolbar.try_add_action(directory_view->view_as_columns_action()));
+    main_toolbar.add_separator();
+    main_toolbar.add_action(directory_view->view_as_icons_action());
+    main_toolbar.add_action(directory_view->view_as_table_action());
+    main_toolbar.add_action(directory_view->view_as_columns_action());
 
     breadcrumbbar.on_path_change = [&](auto selected_path) {
         if (FileSystem::is_directory(selected_path)) {
diff --git a/Userland/Applications/FontEditor/MainWidget.cpp b/Userland/Applications/FontEditor/MainWidget.cpp
index 2b02eacd5e9..c734ce5a209 100644
--- a/Userland/Applications/FontEditor/MainWidget.cpp
+++ b/Userland/Applications/FontEditor/MainWidget.cpp
@@ -378,33 +378,33 @@ ErrorOr<void> MainWidget::create_actions()
 ErrorOr<void> MainWidget::create_toolbars()
 {
     auto& toolbar = *find_descendant_of_type_named<GUI::Toolbar>("toolbar");
-    (void)TRY(toolbar.try_add_action(*m_new_action));
-    (void)TRY(toolbar.try_add_action(*m_open_action));
-    (void)TRY(toolbar.try_add_action(*m_save_action));
-    TRY(toolbar.try_add_separator());
-    (void)TRY(toolbar.try_add_action(*m_cut_action));
-    (void)TRY(toolbar.try_add_action(*m_copy_action));
-    (void)TRY(toolbar.try_add_action(*m_paste_action));
-    (void)TRY(toolbar.try_add_action(*m_delete_action));
-    TRY(toolbar.try_add_separator());
-    (void)TRY(toolbar.try_add_action(*m_undo_action));
-    (void)TRY(toolbar.try_add_action(*m_redo_action));
-    TRY(toolbar.try_add_separator());
-    (void)TRY(toolbar.try_add_action(*m_open_preview_action));
-    TRY(toolbar.try_add_separator());
-    (void)TRY(toolbar.try_add_action(*m_previous_glyph_action));
-    (void)TRY(toolbar.try_add_action(*m_next_glyph_action));
-    (void)TRY(toolbar.try_add_action(*m_go_to_glyph_action));
+    toolbar.add_action(*m_new_action);
+    toolbar.add_action(*m_open_action);
+    toolbar.add_action(*m_save_action);
+    toolbar.add_separator();
+    toolbar.add_action(*m_cut_action);
+    toolbar.add_action(*m_copy_action);
+    toolbar.add_action(*m_paste_action);
+    toolbar.add_action(*m_delete_action);
+    toolbar.add_separator();
+    toolbar.add_action(*m_undo_action);
+    toolbar.add_action(*m_redo_action);
+    toolbar.add_separator();
+    toolbar.add_action(*m_open_preview_action);
+    toolbar.add_separator();
+    toolbar.add_action(*m_previous_glyph_action);
+    toolbar.add_action(*m_next_glyph_action);
+    toolbar.add_action(*m_go_to_glyph_action);
 
     auto& glyph_transform_toolbar = *find_descendant_of_type_named<GUI::Toolbar>("glyph_transform_toolbar");
-    (void)TRY(glyph_transform_toolbar.try_add_action(*m_flip_horizontal_action));
-    (void)TRY(glyph_transform_toolbar.try_add_action(*m_flip_vertical_action));
-    (void)TRY(glyph_transform_toolbar.try_add_action(*m_rotate_counterclockwise_action));
-    (void)TRY(glyph_transform_toolbar.try_add_action(*m_rotate_clockwise_action));
+    glyph_transform_toolbar.add_action(*m_flip_horizontal_action);
+    glyph_transform_toolbar.add_action(*m_flip_vertical_action);
+    glyph_transform_toolbar.add_action(*m_rotate_counterclockwise_action);
+    glyph_transform_toolbar.add_action(*m_rotate_clockwise_action);
 
     auto& glyph_mode_toolbar = *find_descendant_of_type_named<GUI::Toolbar>("glyph_mode_toolbar");
-    (void)TRY(glyph_mode_toolbar.try_add_action(*m_paint_glyph_action));
-    (void)TRY(glyph_mode_toolbar.try_add_action(*m_move_glyph_action));
+    glyph_mode_toolbar.add_action(*m_paint_glyph_action);
+    glyph_mode_toolbar.add_action(*m_move_glyph_action);
 
     return {};
 }
diff --git a/Userland/Applications/Help/MainWidget.cpp b/Userland/Applications/Help/MainWidget.cpp
index 6251fa87e83..1b9af82c941 100644
--- a/Userland/Applications/Help/MainWidget.cpp
+++ b/Userland/Applications/Help/MainWidget.cpp
@@ -200,9 +200,9 @@ ErrorOr<void> MainWidget::initialize_fallibles(GUI::Window& window)
         open_page(help_index_path);
     });
 
-    (void)TRY(m_toolbar->try_add_action(*m_go_back_action));
-    (void)TRY(m_toolbar->try_add_action(*m_go_forward_action));
-    (void)TRY(m_toolbar->try_add_action(*m_go_home_action));
+    m_toolbar->add_action(*m_go_back_action);
+    m_toolbar->add_action(*m_go_forward_action);
+    m_toolbar->add_action(*m_go_home_action);
 
     auto file_menu = window.add_menu("&File"_string);
     file_menu->add_action(GUI::CommonActions::make_quit_action([](auto&) {
diff --git a/Userland/Applications/ImageViewer/main.cpp b/Userland/Applications/ImageViewer/main.cpp
index a2870b0a56b..73c7cb2b894 100644
--- a/Userland/Applications/ImageViewer/main.cpp
+++ b/Userland/Applications/ImageViewer/main.cpp
@@ -294,17 +294,17 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         }
     };
 
-    (void)TRY(main_toolbar->try_add_action(open_action));
-    (void)TRY(main_toolbar->try_add_action(delete_action));
-    (void)TRY(main_toolbar->try_add_separator());
-    (void)TRY(main_toolbar->try_add_action(go_first_action));
-    (void)TRY(main_toolbar->try_add_action(go_back_action));
-    (void)TRY(main_toolbar->try_add_action(go_forward_action));
-    (void)TRY(main_toolbar->try_add_action(go_last_action));
-    (void)TRY(main_toolbar->try_add_separator());
-    (void)TRY(main_toolbar->try_add_action(zoom_in_action));
-    (void)TRY(main_toolbar->try_add_action(reset_zoom_action));
-    (void)TRY(main_toolbar->try_add_action(zoom_out_action));
+    main_toolbar->add_action(open_action);
+    main_toolbar->add_action(delete_action);
+    main_toolbar->add_separator();
+    main_toolbar->add_action(go_first_action);
+    main_toolbar->add_action(go_back_action);
+    main_toolbar->add_action(go_forward_action);
+    main_toolbar->add_action(go_last_action);
+    main_toolbar->add_separator();
+    main_toolbar->add_action(zoom_in_action);
+    main_toolbar->add_action(reset_zoom_action);
+    main_toolbar->add_action(zoom_out_action);
 
     auto file_menu = window->add_menu("&File"_string);
     file_menu->add_action(open_action);
diff --git a/Userland/Applications/PixelPaint/MainWidget.cpp b/Userland/Applications/PixelPaint/MainWidget.cpp
index f9812872485..5e395ecfe04 100644
--- a/Userland/Applications/PixelPaint/MainWidget.cpp
+++ b/Userland/Applications/PixelPaint/MainWidget.cpp
@@ -1178,19 +1178,19 @@ ErrorOr<void> MainWidget::initialize_menubar(GUI::Window& window)
         });
 
     auto& toolbar = *find_descendant_of_type_named<GUI::Toolbar>("toolbar");
-    (void)TRY(toolbar.try_add_action(*m_new_image_action));
-    (void)TRY(toolbar.try_add_action(*m_open_image_action));
-    (void)TRY(toolbar.try_add_action(*m_save_image_action));
-    TRY(toolbar.try_add_separator());
-    (void)TRY(toolbar.try_add_action(*m_cut_action));
-    (void)TRY(toolbar.try_add_action(*m_copy_action));
-    (void)TRY(toolbar.try_add_action(*m_paste_action));
-    (void)TRY(toolbar.try_add_action(*m_undo_action));
-    (void)TRY(toolbar.try_add_action(*m_redo_action));
-    TRY(toolbar.try_add_separator());
-    (void)TRY(toolbar.try_add_action(*m_zoom_in_action));
-    (void)TRY(toolbar.try_add_action(*m_zoom_out_action));
-    (void)TRY(toolbar.try_add_action(*m_reset_zoom_action));
+    toolbar.add_action(*m_new_image_action);
+    toolbar.add_action(*m_open_image_action);
+    toolbar.add_action(*m_save_image_action);
+    toolbar.add_separator();
+    toolbar.add_action(*m_cut_action);
+    toolbar.add_action(*m_copy_action);
+    toolbar.add_action(*m_paste_action);
+    toolbar.add_action(*m_undo_action);
+    toolbar.add_action(*m_redo_action);
+    toolbar.add_separator();
+    toolbar.add_action(*m_zoom_in_action);
+    toolbar.add_action(*m_zoom_out_action);
+    toolbar.add_action(*m_reset_zoom_action);
 
     m_zoom_combobox = TRY(toolbar.try_add<GUI::ComboBox>());
     m_zoom_combobox->set_max_width(75);
@@ -1230,8 +1230,8 @@ ErrorOr<void> MainWidget::initialize_menubar(GUI::Window& window)
         m_zoom_combobox->on_change(m_zoom_combobox->text(), GUI::ModelIndex());
     };
 
-    TRY(toolbar.try_add_separator());
-    (void)TRY(toolbar.try_add_action(*m_levels_dialog_action));
+    toolbar.add_separator();
+    toolbar.add_action(*m_levels_dialog_action);
 
     return {};
 }
diff --git a/Userland/DevTools/GMLPlayground/MainWidget.cpp b/Userland/DevTools/GMLPlayground/MainWidget.cpp
index b10597cc1d5..b96d99f8f34 100644
--- a/Userland/DevTools/GMLPlayground/MainWidget.cpp
+++ b/Userland/DevTools/GMLPlayground/MainWidget.cpp
@@ -279,18 +279,18 @@ ErrorOr<void> MainWidget::initialize_menubar(GUI::Window& window)
     }));
     help_menu->add_action(GUI::CommonActions::make_about_action("GML Playground", m_icon, &window));
 
-    (void)TRY(m_toolbar->try_add_action(open_action));
-    (void)TRY(m_toolbar->try_add_action(*m_save_action));
-    (void)TRY(m_toolbar->try_add_action(*m_save_as_action));
-    TRY(m_toolbar->try_add_separator());
-    (void)TRY(m_toolbar->try_add_action(m_editor->cut_action()));
-    (void)TRY(m_toolbar->try_add_action(m_editor->copy_action()));
-    (void)TRY(m_toolbar->try_add_action(m_editor->paste_action()));
-    TRY(m_toolbar->try_add_separator());
-    (void)TRY(m_toolbar->try_add_action(m_editor->undo_action()));
-    (void)TRY(m_toolbar->try_add_action(m_editor->redo_action()));
-    TRY(m_toolbar->try_add_separator());
-    (void)TRY(m_toolbar->try_add_action(format_gml_action));
+    m_toolbar->add_action(open_action);
+    m_toolbar->add_action(*m_save_action);
+    m_toolbar->add_action(*m_save_as_action);
+    m_toolbar->add_separator();
+    m_toolbar->add_action(m_editor->cut_action());
+    m_toolbar->add_action(m_editor->copy_action());
+    m_toolbar->add_action(m_editor->paste_action());
+    m_toolbar->add_separator();
+    m_toolbar->add_action(m_editor->undo_action());
+    m_toolbar->add_action(m_editor->redo_action());
+    m_toolbar->add_separator();
+    m_toolbar->add_action(format_gml_action);
 
     return {};
 }
diff --git a/Userland/Games/GameOfLife/main.cpp b/Userland/Games/GameOfLife/main.cpp
index 36b9a7beab6..0f92c9b546c 100644
--- a/Userland/Games/GameOfLife/main.cpp
+++ b/Userland/Games/GameOfLife/main.cpp
@@ -104,33 +104,33 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     });
 
     toggle_running_action->set_checkable(true);
-    auto toggle_running_toolbar_button = TRY(main_toolbar.try_add_action(toggle_running_action));
+    auto& toggle_running_toolbar_button = main_toolbar.add_action(toggle_running_action);
 
     auto run_one_generation_action = GUI::Action::create("Run &Next Generation", { Mod_Ctrl, Key_Equal }, TRY(Gfx::Bitmap::load_from_file("/res/icons/16x16/go-forward.png"sv)), [&](const GUI::Action&) {
         statusbar.set_text(click_tip);
         board_widget->run_generation();
     });
-    (void)TRY(main_toolbar.try_add_action(run_one_generation_action));
+    main_toolbar.add_action(run_one_generation_action);
 
     auto clear_board_action = GUI::Action::create("&Clear board", { Mod_Ctrl, Key_N }, TRY(Gfx::Bitmap::load_from_file("/res/icons/16x16/delete.png"sv)), [&](auto&) {
         statusbar.set_text(click_tip);
         board_widget->clear_cells();
         board_widget->update();
     });
-    (void)TRY(main_toolbar.try_add_action(clear_board_action));
+    main_toolbar.add_action(clear_board_action);
 
     auto randomize_cells_action = GUI::Action::create("&Randomize board", { Mod_Ctrl, Key_R }, TRY(Gfx::Bitmap::load_from_file("/res/icons/16x16/reload.png"sv)), [&](auto&) {
         statusbar.set_text(click_tip);
         board_widget->randomize_cells();
         board_widget->update();
     });
-    (void)TRY(main_toolbar.try_add_action(randomize_cells_action));
+    main_toolbar.add_action(randomize_cells_action);
 
     auto rotate_pattern_action = GUI::Action::create("&Rotate pattern", { 0, Key_R }, TRY(Gfx::Bitmap::load_from_file("/res/icons/16x16/redo.png"sv)), [&](auto&) {
         board_widget->selected_pattern()->rotate_clockwise();
     });
     rotate_pattern_action->set_enabled(false);
-    (void)TRY(main_toolbar.try_add_action(rotate_pattern_action));
+    main_toolbar.add_action(rotate_pattern_action);
 
     auto game_menu = window->add_menu("&Game"_string);
 
@@ -154,11 +154,11 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     board_widget->on_running_state_change = [&]() {
         if (board_widget->is_running()) {
             statusbar.set_text("Running..."_string);
-            toggle_running_toolbar_button->set_icon(*paused_icon);
+            toggle_running_toolbar_button.set_icon(*paused_icon);
             main_widget->set_override_cursor(Gfx::StandardCursor::None);
         } else {
             statusbar.set_text(click_tip);
-            toggle_running_toolbar_button->set_icon(*play_icon);
+            toggle_running_toolbar_button.set_icon(*play_icon);
             main_widget->set_override_cursor(Gfx::StandardCursor::Drag);
         }
 
diff --git a/Userland/Libraries/LibGUI/Toolbar.cpp b/Userland/Libraries/LibGUI/Toolbar.cpp
index a74e8dcb6d5..47a87c283ce 100644
--- a/Userland/Libraries/LibGUI/Toolbar.cpp
+++ b/Userland/Libraries/LibGUI/Toolbar.cpp
@@ -97,44 +97,25 @@ private:
     }
 };
 
-ErrorOr<NonnullRefPtr<GUI::Button>> Toolbar::try_add_action(Action& action)
+Button& Toolbar::add_action(Action& action)
 {
-    auto item = TRY(adopt_nonnull_own_or_enomem(new (nothrow) Item));
+    auto item = make<Item>();
     item->type = Item::Type::Action;
     item->action = action;
 
-    // NOTE: Grow the m_items capacity before potentially adding a child widget.
-    //       This avoids having to untangle the child widget in case of allocation failure.
-    TRY(m_items.try_ensure_capacity(m_items.size() + 1));
-
-    item->widget = TRY(try_add<ToolbarButton>(action));
+    item->widget = add<ToolbarButton>(action);
     item->widget->set_fixed_size(m_button_size, m_button_size);
 
-    m_items.unchecked_append(move(item));
+    m_items.append(move(item));
     return *static_cast<Button*>(m_items.last()->widget.ptr());
 }
 
-GUI::Button& Toolbar::add_action(Action& action)
-{
-    auto button = MUST(try_add_action(action));
-    return *button;
-}
-
-ErrorOr<void> Toolbar::try_add_separator()
-{
-    // NOTE: Grow the m_items capacity before potentially adding a child widget.
-    TRY(m_items.try_ensure_capacity(m_items.size() + 1));
-
-    auto item = TRY(adopt_nonnull_own_or_enomem(new (nothrow) Item));
-    item->type = Item::Type::Separator;
-    item->widget = TRY(try_add<SeparatorWidget>(m_orientation == Gfx::Orientation::Horizontal ? Gfx::Orientation::Vertical : Gfx::Orientation::Horizontal));
-    m_items.unchecked_append(move(item));
-    return {};
-}
-
 void Toolbar::add_separator()
 {
-    MUST(try_add_separator());
+    auto item = make<Item>();
+    item->type = Item::Type::Separator;
+    item->widget = add<SeparatorWidget>(m_orientation == Gfx::Orientation::Horizontal ? Gfx::Orientation::Vertical : Gfx::Orientation::Horizontal);
+    m_items.append(move(item));
 }
 
 void Toolbar::paint_event(PaintEvent& event)
@@ -176,7 +157,7 @@ ErrorOr<void> Toolbar::create_overflow_objects()
 
     add_spacer();
 
-    m_overflow_button = TRY(try_add_action(*m_overflow_action));
+    m_overflow_button = add_action(*m_overflow_action);
     m_overflow_button->set_visible(false);
 
     return {};
diff --git a/Userland/Libraries/LibGUI/Toolbar.h b/Userland/Libraries/LibGUI/Toolbar.h
index 9024a64d320..9defb2b07ea 100644
--- a/Userland/Libraries/LibGUI/Toolbar.h
+++ b/Userland/Libraries/LibGUI/Toolbar.h
@@ -18,9 +18,6 @@ class Toolbar : public Widget {
 public:
     virtual ~Toolbar() override = default;
 
-    ErrorOr<NonnullRefPtr<GUI::Button>> try_add_action(GUI::Action&);
-    ErrorOr<void> try_add_separator();
-
     GUI::Button& add_action(GUI::Action&);
     void add_separator();