I know a lot of raw feeders leave off the skin because a) its very fatty and b) it often gives the dog the runs. I never removed it because I always was trying to get my dog to gain weight, he's always skinny. But when just starting out, I probably should have removed the skin off the backs because I think it was tough to digest at first. Even without the skin, there will likely be an adjustment period ranging from loose stools and other digestive problems. Digestive enzymes are helpful to aid in that beginning, or feed yogurt.
I use to just see what he could handle on the leg bones and then cut the rest of the meat off the bone and feed it to him. I also smashed the bones with a meat hammer sometimes and it was easier for him to handle, although you have to watch for sharp bone pieces. If you cook the bones of course just make sure you remove the bones before feeding.