After baking, use a serrated knife to flatten out the cake and chill the cake for 30 minutes before frosting to make then firm and easy to work with.
Apply a thin layer of frosting on the cake to catch any loose crumbs and lock the crumbs to prevent them from mixing with the final layer.
Use a turntable, offset spatula and bench scraper to ensure smooth and even frosting.
Don't be stingy with the frosting and apply a generous amount from the top to side to achieve a smooth finish.
After applying the final layer, smoothen it with bench scraper and chill the cake for some time to set everything perfectly.