If the bird has white nails, it will be easy to see the blood vessel--DO NOT clip below the quick. (Do not cut below the quick or it will bleed and be painful--be sure your nail clippers are sharp). If the nail bleeds, use Wonder dust, baking powder or cornstarch to stop the bleeding fast. Never cut more then 1/3 of the entire length of any toenail, no matter how overgrown.
Video on: How to care for your birds feet
Professional Pet Sitting Services offered in the Upper to Mid-Pinellas County Area