The most humane way would be to break its neck. Cut an opening at the neck and let it hang for a few hours, to drain the blood out. Then skin it, Easiest way is to finnish the incision around the neck then pretty much turn it inside out like taking a shirt off, or a pillowcase. You may need a knife to get some of the stubborn skin off.
If you have ever cut up a whole chicken to make something out of it, its the same principle. Butcher it silimar to a chicken. I would take the feet and head off, if you have people that may be put off by those things. Other than that, just like a chicken.
I hope this helps ^_^