Well he went about 95% right, except you don pull the tail with your hand unless you've being doing it for as many years as I have,lol

There is a gadget for pulling the skin, but if you don't want to invest in it, then you need to skin the tail as far as it will go, without ripping it as your friend did, then you sandwich the tail bone with two small pieces of wood or even two scre driver handles and pull the skin toward the tip, by hand it takes a lot of strength on your thumbs.