Listen, learn and address problems as soon as they are noticed. Allow your child lots of independent learning opportunities. Find a way to incorporate a child's hobbies and interests into everyday learning opportunities. Help keep your child focused, yes, but allow him some room to explore on his own. Too much restriction can easily, and very quickly, stifle the child's curiosity and willingness to learn at all.
Perfectionist tendencies can kill curiosity and learning in a heartbeat.
Let your child be human. Insist that your child be human. Encourage your child, yes. But try to find few ways to correct the child in such a way that it affects his self-esteem as little as possible. Chances are, with a gifted child, he has already seen his mistake, and is not only keenly aware of it, but is also on an up and down roller coaster ride because of it.