I groomed dogs in my house for many years. Mostly toy poodles. Many of them hated getting their feet shaved & nails clipped & would jerk their feet. It made it very hard to get done. I would instruct each owner to genlty rub their feet so they'd get used to the feel. I also bred & sold toy poodle puppies for many years & it was one of the instructions I always insisted they do, so as to make it less stressful for the dog. Try shaving a jerking foot or painting nails on a jerking foot. Not easy. I would calmly talk them thru it. I had a few that other groomers refused to do, as the dogs had major fear of anyone, including their owners touching their feet. They would growl & snap. One lady brought me her dog & said he bites if you try to touch his feet. It had been abused by previous owners who I assume thought it was funny to grab it's feet. It had to be sedated by the vet to get it's nails clipped. She came back to get her dog & insisted I was trying to give her someone elses dog, LOL. I had it's feet clipped, nails painted & a bow in it's hair. Animals have very sensitive feet & they should never be grabbed.
When we got our parrots I did the same thing. Rubbed their feet. JaKhu has gotten her feet rubbed daily since I got her last August. Jasmine U2 loves to have her feet rubbed. Jengo CAG not as much, but she tolerates it.
Filing is a bit different than just clipping. You need to hold the nail still, so it doesn't move back & forth while filing. The larger files they use for acrylic nails work well, as do metal files. My husband had special metal files made for me, by a machinist, at his work place before he retired. Even a macaw can't bend these files.
I'd also suggest a pedi perch or a cement perch. They both help to keep the shape points filed down naturally.