Well, my BC thought my vet was the devil, but saw me as her savior when we were there. So at least she didn't hold it against me that I took her there. However, she let me trim or file her nails.
My Nanday won't let me trim her nails, and even gets angry if she sees me doing my own, lol! Thankfully her cement perch seems to do a good job and I haven't had to trim her nails for years. I even see her using it on purpose to groom herself.
One thing my vet did though was trim off the little black needle point on my BC's beak. I had to tell him that it was normal for that species, and not overgrown. I admit, it's kind of odd, and I don't know of any other species that has a beak like that.
Other than that, I have never had to have the beaks done. I think if you provide plenty of chewing material, most birds will take care of it themselves.
The former owner of my amazon did all of it himself: nails, wings, beak. I don't want to do a beak myself, I admit. I am hoping now that he has a large cage and toys I won't have to. He's definitely chewing his toys so hopefully that will take care of it. If not, I will let the vet deal with that.