Hi! I pinion. This year I got a wake up call as to what happens to birds who can fly and get loose in my neighborhood when someone decided to dump a wild guinea in my suburban yard. It's not hard, and honestly if done within the first week or so of hatch they protest more at being held than the pinion part. It's even a lot less traumatic than clipping wings, and honestly it reminds me of getting ears pierced. It doesn't make me happy, but if pinioning one wing keeps my birds safe and prevents them from flying off and getting hit by a car (or shot) and makes it so I don't have to grab and hold them down to clip wings every year I'll do it. If you do it, just make sure you don't clip too high. They have a little thumb where the bone seems to start. They should keep the thumb and everything up. They don't seem to miss it and live, safe, fed birds are happier than flying, lost, or dead ones. I love my duckies!