How to Trim a Bird's Beak
Many pet birds for sale can develop overgrown beaks after a while, particularly finches. However this is nothing to worry about and can be remedied easily. Overgrown beaks can be a sign of illness so you should check this with your vet first – however, if it’s a simple matter of a slight beak overgrowth, you can safely trim at home.
Wrap the bird, including its head, with its beak exposed. Covering the bird's eyes help keep the bird calm during trimming.
Hold the bird in your non-dominant hand, using your thumb to stabilize its head.
Grasp the scissors or file in your dominant hand and carefully shave a very small piece off the tip of the beak. Think of "shaving off" some beak instead of cutting it. Take great care not to cut too far and cause bleeding. Shave off the smallest amount possible to control the overgrowth. If you cut too far, apply styptic powder to stop the bleeding.
Release your bird carefully back into its cage and monitor it for a few minutes to ensure it's not behaving abnormally.