the "bites" aren't agression they are trying to find a way to mate your hand.
A lot of my young roos do this. They get rebuffed by the females and they are sexually frustrated. My little guy Chewy would run across the paddock to me if I held my hand down. He didn't bite hard and I adapted the behavior by swooping him up as soon as he bit. He would stop and just hang out at that point.
With older roosters, I grab them and pick them up if they bite and carry them around a bit. This soon discourages any attacks because they don't want to get picked up and becoming familiar with being handled also makes them consider me less of a threat.
Animals can sense fear. The farmer next door to me was afraid of his big aggressive Jersey Giant roo, as was anyone who got near the paddock. I asked him if I could handle the bird. I tried to approach the bird but instead of attacking, he ran and would not let me get anywhere near him. He could tell that I had no fear of him so he surrendered.
The best thing is to sit with chicks for a short time each day. They'll eventually get curious and peck gently at your feet. You can then hang your hands down and let them become accustomed to the hand. After that you'll soon be able to scoop them up and let them perch on your hand. The trick is to wait until they come to you, instead of chasing them. The fear factor is eliminated. Roosters that I raise this way are always gentle with humans.
