My rescue cat is about 12 or 13, and a wiggle-worm. I find it impossible to clip his claws. I arranged an in-home visit from a young woman who works in a pet store, and she managed to get all his claws except 2. She had a hard time with the wiggle-worm, and said it would be easier at the store, where they have a kind of harness they can put the cat into.
The thing is, perhaps due to the wiggling, she didn't clip his claws short enough, and after only a week if he kneads me, he draws blood.
If I take him to the store, or a groomer, and he gets a decent clipping, how often would it need to be done? He doesn't like his travel cage either.