Mine is only 13 weeks old, and she is very shy also. We give her mini foot baths, that's when she gets relaxed and be able to grab a feet to trim her nails. Then afterwards, give her some mealies or some treats. Good Luck. Also sometimes it best to have two people, one holding and the other trims.
I found with my hedgie that if I blew on his face gently, he would pop out and it would calm him down quite a bit if he was worked up. Possibly try that and then flip him onto his back and try to get ahold of one of his feet? Also, I find it a lot easier to trim their nails if you use regular run of the mill clippers like you would use on your own nails and cut all of their nails on one foot at once as opposed to doing them individually.