Take a pair of scissors and cut the belly side in half starting with where the head used to be all the way down to the tail and then you just pull the body away from the skin. One of the easiest critters to skin. I would use a pair of rubber gloves. They don't smell too good. After you have the skin removed, get a 1x6 or 1x8 board, whatever it takes, and place the skin, good side down and tack the edges with finishing nails down each side until you have the skin stretched out nice and even. Then apply a good dose of borax and let it sit for about a week or so. This will absorb the moisture and keep the smell down. Then brush off the excess borax and roll up and store until you need it. Pretty easy, just a little stinky.
Andy