The majority of the time I cut Ruby's nails myself. She HATES it It usually takes me awhile since she can be so squirmy, but other than that I never have had any problems. I usually give her front paws a trim about once a month. Her back paws seem to either file themselves down or just don't grow as quickly, so I clip them every couple months.

Sometimes I get her vet to do it (because she acts like a perfect angel for her). And If I see a nail clipping booth at a dog event I'll have them done there (I really don't like doing it so I seize any opportunity I get to have someone else take care of it ).