Well, my pastel just shed this past Sunday. When I got up in the morning I noticed he was working on getting it off so I left him alone to let him work it out. Then I went back a few hours later and it wasn't pretty so I figured it was time to intervene. I put him in the luke warm water for about 40 minutes to an hour with a wash rag in case he wanted to move around and get it off himself. He seemed to know what I was doing because he just sat there and enjoyed the soaking. When I took him out, I took that damp wash cloth and let him crawl through it until all of the skin came off nicely. It works like a charm especially if you have a cooperative BP. Make sure if you do this technique that you are on a towel or somewhere you don't mind getting crapped on because they more than likely will pee and poop when they shed.
I really felt bad because it was my fault he didn't shed in one piece due to not getting his humidity right so I figured it was my duty to fix it. Now I have to examine my setup because this is the second time in three sheds I had to help him.