Pinioning is actually cutting off the last section of wing. On ducks it is done as day or two old, from one wing. I have not done it yet, these will be my first ducks. If done as day or two there is very little to no bleeding and recovery is very quick. Unlike clipping feathers, it never has to be redone and they absolutely cannot fly, where some determined ones can fly after clipping feathers. Many people have fits about it (much like caponizing) but I CAN NOT have any to go over the fence, it would be a horrible death, much worse then an instant clip as a day old.
I helped my Uncle do it to my ducklings as a child. Really pretty easy, we just used large toe nail clippers! I only remember one actually bleeding, we went a bit too far in, but it wasn't a big deal. As with caponizing they are more unhappy about being held still than anything else!!!!