If you can catch the cat, you can clip its toenails. My nasty brat Bosun is hard to do. I kneel down and pin her between my knees. For the right paw, I have the back of my left hand turning her head so she can't bite, and hold the paw with the left and clip with the right. The left is a little harder since I'm right handed; hold the clippers, use the back of the hand to turn the head.

I usually don't bother with the back claws, since cats rarely "rear-wheel drive" anything besides toys.