I would definitely recommend a professional foot trimmer, preferably one with a turn over crush. This is like a light weight crush into which the cow goes and it is then turned hydraulically through 90 degrees so that the cow is effectively lying on her side with her feet sticking out and easy to reach with no danger of being kicked.
Our trimmer is a lot cheaper than a vet and is actually called in by our vet when specialist treatment is needed. He last charged about £80 for one foot trim and dehorning 2 calves.
Incidentally I have tried the other options.
My first ever cow was a very well behaved, well handled and halter trained Dexter. She stood quietly while a local farrier trimmed her hooves ready for a show. But I have never had another animal that I would trust to that extent without proper restraint.
The next time I called the vet in. This was for another little Dexter. I had her in a proper crush and the vet was experienced, but she still managed to send him flying across the yard.
Then I discovered our foot trimmer. He's great, and much less stress on the animals as they are not fighting each time a leg is held.
Pity you're not still in Yorkshire, YL, or I would have given you his number.