stuck;it depends on what you take,as to clean or not.

the only thing I would say clean is a big game animal ; deer ; antalope ;bear or the like.

all the small game , you can leave as is.
Go talk to you local taxidermist and see what he wants you to do with an animal.he should have a card that shows where and where not to cut.get a copy and be very careful with the knife.don't cut the skin or hide.