RE: how hard..?
Gut the deer as you usually would.
I dont know any butchers that would refuse a deer that has been skinned. Just take a tarp with you so that once you skin your deer you dont get dirt in the meat.
Get a taxidermist to tan your hide. You can do it, unprofessionally without chemicals, but i do not know how.
It should be very inexpensive to just tan a deer hide thru your taxidermist.