My sister-in-law had a white Ermine, named Cleo, who got badly matted. Cleo seemed to appreciate a brush and a trim, because her mistress had neglected her. She laid on my tummy and purred, when I had the cramps.
If you're going to do it yourself, go to the bathroom nonchalantly. Set it up. Walk by the cat, nonchalantly,(don't even think about what you're going to do, or look at the cat, because they're mind readers, and they'll run.) Just as you're passing, grab 'em!