Option1: Using a Serrated Knife
Place the cake on a cake board, then place the board on a cake stand. While slowly rotating the cake stand, move the knife back and forth across the top of cake in a sawing motion to remove the crown. Try to keep the knife level as you cut.
Option 2: Using a Cake Leveler
Place the cake on a cake board. Position the ends of the cutting wire (or feet on the large cake leveler) into the notches at the desired height. With legs standing on the work surface, cut into the crusted edge using an easy sawing motion, then proceed by gently gliding wire through the cake.