Hook training is a must IMO. Frequent handling, especially through the nippy stage. Reliable food supply. I would suggest feeding in a separate enclosure, if possible. The burm I had was fed in its enclosure and had a tendency to come at the door rather aggressive, until the hook training. Still had to be on my toes tho. It's intimidating to have a 12 foot snake coming at the door FAST. Remember, they seem kinda laid back most of the time, but man these guys can be quick when they want something. Oh and don't forget the have someone experienced around to help out when they start getting larger, say around the 6-8 foot range.
I love these snakes, but they demand a huge amount of respect and commitment.