You can trim feathers around wounds to keep them out of it and help prevent infection. Unless they are newly growing feathers (blood feathers) they will not bleed. Once feathers are fully formed the blood supply is withdrawn. Just use a small pair of scissors to trim back as needed, many use blunt school scissors to be sure they won't accidentally poke the bird, small nail scissors work well also. In the unlikely event that a feather bled you could just pluck that one out and stop the bleeding with pressure, I doubt that will happen, and it won't hurt cutting them, the only nerves are in the skin at the base.