How do I know where to file? What do you use to file/trim?
A pedi-paws, like ramirezframing said.

You should be able to see on the sides of the beak where it has a bit more growth. It's like shaping a lid for a tea kettle! You just need to gently shave off what you can so that the beak seats correctly. My crossbeak's face wont seat correctly. I take down the sides as best as I can so it has a more solid fit. I am hoping, eventually, if I keep at it that the beak will either stay the same so he can still eat/drink OR get a bit better with grow out. We'll see.
