Grace used to get her claws done at the kennels when she went back to stay, but I suspect they were none too gentle as I could hear her yelping and making the most awful noise. Yes it is an ordeal, they really feel pain and it is not unknown for the quick to be cut into by an overenthusiastic kennel maid. I decided after her OP last year that she would not go into kennels again as she is an old lady and I couldn't abandon her again, so we don't go away!!
The nurses at the vets are very good at claws, quite gentle ,( even so I go out to the car park!) but even that has become a problem as she has to be taken in the car and frankly I am not sure her back legs are up to jumping in like she used to
so I haven't tried again since her last annual check up and boosters in August . Moral, only get a dog small enough to lift!
I may well have to find a way round this ere long, (Pets to Vets sounds like a good service) but I will cross that bridge when I have to! Sorry not to be more help, front claws are an issue although I find walking her on pavements keeps the back claws short enough anyway.