Hey there, I know exactly what you're dealing with. I Love pit bulls and had one for 13 years. Now my dog was very very chill when it came to bath time and getting his nails trimmed. But I also had him since he was 4 weeks old and I used to mess with him all the time while we would lay together ( put fingers in his mouth, ears, play with his toes, etc. ) which i think helps. Anyways my roommate has a blue and our dogs lived together and she HATED getting her nails trimmed.. mind you shes about 65 lbs with a massive head. Built like a tank and super strong. We would have hold her down unfortunately as best as we could. Literally my roommate would hold her with all his strength and I would take one of those pet grooming dremel kits (I got on amazon) and just go for it. Those dremels worked the best in my experience, really easy and fast. Before we had the dremel and just clippers it was almost impossible to trim her nails. I know it sucks to have to hold the dog down but maybe that dremel would help you. Also we would leave it out for her too, to help her get used to it. even when she would lay in her bed we would set it next to her.

this is the dremel I use. http://www.amazon.com/Dremel-7300-PT-4-8-Volt-Pet-Grooming/dp/B003TU0XG4/ref=sr_1_1?ie=UTF8&qid=1406066521&sr=8-1&keywords=dog+dremel

Good luck!

Mine does EVERY time!! I got the dog dremel off of Amazon because I don’t trust myself clipping the black nails and he knows it. Now, it’s a little better and I do more often since they are filed and not clipped. Amazon Dog Dremel

I use the battery powered Dremel. They have one on Amazon for pets and it comes with instructions(for pet use) and some sanding drums. Dremel 7300-PT 4.8-Volt Pet Grooming Kit https://www.amazon.com/dp/B003TU0XG4/ref=cm_sw_r_awd_zePWub0KSDKZR

The price has changed since I got it. It was the same price as the non pet one. Just do a little at a time even if its on nail then come back later and do another one. Another thing is having them walk on concrete .