I'm sure there are lots of online how-to's, it's worth searching for yourself because all taxidermy sites are always amazing.
you might wish to try and track down this documentary
Taxidermy: Stuff The World
I caught the last ten minutes or so, here's Charlie Brooker's opinion on it
Anyway, speaking of trophies and hunting and mounting and raw animal lust, lurking in the schedules this week is an absolutely magnificent documentary called Taxidermy: Stuff The World (Mon, 9pm, BBC2), which follows a disparate group of taxidermists in the run-up to the 2005 World Taxidermy Championships. On paper, it sounds like a throwaway quirk-fest. It isn't. It's far, far better than that.
By the end, you'll have been amused, enlightened, impressed, repulsed, stunned, infuriated and moved. Probably in that order. There's also a good chance you'll throw up, so consider yourself warned. Whatever happens, when the credits roll, you'll be on your knees praying that Roy burns in hell for eternity on account of what he's done.
And if you want to know who Roy is, or what the hell I'm talking about, you'll have to tune in and see for yourself. I strongly urge you to do so.
Pep Up The Turmoil