To carve a cake I recommend making it 2 days before the party. You need to freeze the cake completely before carving into it. This is the same thing they do in grocery stores. They also decorate the butter cream cakes the day before your order anyway (unless you chose whip cream icing--yum!).
My sisters baby shower cake- March 2012. Learn how I made it here
Epic Mickey (made in 2010) based on the Disney game.
For my daughter:
Carved Dress cake for my friends birthday. 2011