Level cake layers, if necessary, using a serrated knife of cake leveler.
Place one cake layer on disposable cake board or serving platter.
Place on turntable. (If you don't have one, it's ok; but if you do, it will make it much easier to frost cakes.)
Spoon about ½ cup of frosting in center of cake layer.
Spread evenly over surface, leaving about ¼ inch unfrosted around the edges.
Repeat with second layer.
Top with final layer of cake.
Spread a thin layer of frosting on the top and sides of the cake (crumb coat).
Refrigerate until set, about 20-30 minutes. (Put the frosting in the fridge, too!)
Remove from refrigerator.
Frost and decorate, as desired.