Have you tried using a grinder? I find it so much easier. He may not tolerate it, the noise can scare them, but if you can get him used to it it's much easier, imo. It's much harder to go into the quick with a grinder as you're taking off a little at a time rather then making a cut.
When I did use a clippers on mine, I found putting them on a table higher up helped for some reason. They would tend to fixate on being higher up and just sorta stand there frozen. hehe. That might just be mine though.
It did seem to make them focus less on getting their nails cut though. I know it sounds weird, but it really worked for me. If I held them in my lap, they would squirm too much. Pip in particular.