My last broody hatch was seven eggs I was hatching for a neighbor. He wanted the chicks immediately after drying off, so I would swap her hatched chicks with nearly two week old bantams that were clearly older that had been running around the chicken yard for a week. She is not people friendly and it was her first hatch, but she is a game hen x silkie. She acts nothing like a silkie, though. I just made sure that she could not see that I was giving them to her, and when she would peck at their wing feathers or look at them like she was considering attacking, I would divert her attention with treats or by rummaging under her chest, sometimes even passing my hand in front of her face. AND I did this in the day time. You just have to be careful about how you do it, and have fast hands. Nimue (the hen) is not stupid in the slightest.