Jackson Heights Life

Hello everyone.  My girlfriend has 2 cats that are not declawed, and she hasn't trimmed their claws in a long time because they aren't the easiest cats to deal with.  We got them claw caps so they don't tear up my leather couch.  Has anyone had experience with these?  I know we have to trim their claws before we put them on, so can anyone recommend a reasonable groomer or vet in the area to do this?  I don't have experience with cats, so I'm not really sure how difficult this will be.  Any advice would be appreciated.  Thanks!