I used to have 2 leopard geckos. Both were sweet as can be and I never really had to deal with biting after the first 2 or 3 weeks. I didn't hand feed, because I didn't want them associating my hands with food, I just think that encourages biting. Never had either drop their tails either. One of my girls was especially sweet and loved crawling up across my body to land on my shoulder and just perch there for a while.