I've tried trimming my rats nails, but only can do it on the boys. The girls are ridiculously squirmy and theres no way I can get them to sit still. I just try to be careful for now, wear shirts that cover my shoulders when they are out. Pants when they are running on the floor (they like to use my legs as highways)
In my experience the brick dosen't do a thing! I have it in front of their water bottles with little or no results. I clip my older boys with a people fingernail clipper but the younger ones are much too wiggly.
I cut the toes out of a pair of old long socks and slip them over my arms when I have ratties running around on me. I also have a dicky that I can slip over my neck rather than changing my shirt.