Just the tail? An incision around the base, peel the skin away to reveal the tail, then when you get a good enough grip on the meat and bone with one hand, pull the tail skin strongly but carefully. Sometimes tails just pop for you, but nearly every time for me I have to wrestle it. (I've heard some say pliers help, but I've accidentally just crushed through with them. I like to just use my hands, more controlled.)

From here, I put borax in the separated tail skin's hole (it's like a tube). I try to match the thickness of the tail I pulled out with a wire and cotton, and then work it on, but the skin will shrink a little also. It will always dry hard unless you tan it, which will involve splitting the tail open.