Hedgie's Claws Curling Under?

I have a hedgie who is terrified of getting his claws clipped. I've been careful to have another person clip his claws while I hold him to minimize the risk of hitting the quick, and he's only bled once, but he squirms to the point of where we can't get anywhere near his claws. Now his claws are starting to curl under quiet badly because we've been unable to clip them. I've heard that using sandpaper can be quiet effective-would it still work with his claws curled under? If so, what should I use to attach it to his wheel? I'd rather avoid this option because my pay check is not great right now, but if I took him to the vet, would they be able to sedate him and cut his claws for us? He still runs on his wheel, so his claws aren't to the point where they're likely doing any damage beyond being an annoyance, but obviously I want to get this taken care of as soon as possible. With his claws curled as they are, would I still be able to clip them normally? Any help that can be given would be great. Thanks!