I have applied quite a few over the years, but never removed any.
I would say it depends mostly on if they were applied over glass or wood.
Removing from glass would be the easiest and safest in my opinion.
After having refinished a lot of bows, it no longer scares me to take sandpaper to glass limbs. As soon as you get through the finish, you know you hit glass. It has a different sound and feel. You have to get pretty aggressive to damage the glass.
If I was to remove skins from glass, I would start with 100 grit paper and start where you can do the least damage to the glass, at the riser, or fades. See how it comes off and how much sanding does it take. Make sure you are sanding on the skins and NOT on the edges of the glass. If you touch glass stop sanding in that area and move on. If 100 grit is too aggressive, go to 150 etc.
If you've never done anything like this before, you might want to hire a pro to do it. There are sponsors that do that sort of thing.