Agree with what Clare and Sandy have said. I use clippers and an enamel emery board to smooth any rough corners left. I’ve had two i rehomed who came with long beaks and it’s a simple but necessary process for the tort.
Eating off rough surfaces like slate or the underside of tiles helps to keep the beak down too, plus as mentioned, cuttlefish is a huge favourite of my creep, more so the females than the males.
Yup, sack the vet!
If it makes you feel better I had a conversation with a vet last year who said she had a tortoise and I asked what species. She looked utterly bewildered! I wasn’t best impressed!