The tail has little bits of fat and flesh on it. These things rot, so they must be removed. In order to scrape it off, you must remove the bone.
You slit from halfway up the tail up almost to the anus. From the tail slit a V on either side of the anus, which connects to your leg-to-leg money cut. Pull the skin away from the base of the tail so you can get either a tail stripper or a clothes pin around the bone. Hold the base of the tail above your stripper with your other hand and yank down towards the tip of the tail. The bone should come out in one smooth motion. The tail should not break because you slit at least halfway down it, and you are not grasping the tail, just the bones. After this, continue cutting splitting the tail to the tip. (Tail slitters are little tools that are very nice for this, they are like a belly hook.) When it's on the beam you must scrape the tail, and when it's boarded you should pin it open so it can dry.
Destroying tails can be easy to do, but everybody does it at least a few times. It comes with practice.