Work with them. Handle every other day. Start by handling only for 2 or 3 minutes, and next time you handle do it for a few minutes longer, until they are cool to be handled whenever.
Go easy on them, leos arent generally into that kind of psycological war fare like iguanas are, the only time a leo did that to me he was in considerable disconfort because of the way it was being kept by the previous owner, just a few days in my house made him a complete sweet lizard. If they show signs of disconfort call it a day.