The best way I've found to pick them up without scaring them is this: Put your hand in the brooder, all the way to the floor, but not near the chick. Then slowly move your hand to the chick, keeping it low. Then either scoop the chick up or gently grab him from his own level.
This way your hand is not swooping down like a hawk!
This way your hand is not swooping down like a hawk!