I wouldn't worry too much about it biting you. My advice is to use a hook to get it out of its cage until you are more confortable with the boa, and he is more comfortable with you. If a boa constrictor is going to bite, it will be when you first put your hand in the cage. It may whip around suddenly to examine what is touching it, but they seldom strike. Once you have it hooked out, just gently place him in your hand, and support as much of the body as possible. I won't personally say that a bite doesn't hurt. I think it stings a bit at first, but it's nothing to write home about.
Scales Zoo sells a huge variety of hooks, and they sell MidWest equipment, which is by far the best you can get. Their website is here:
http://www.scaleszoo.com . Port Credit Pets in Toronto carries a few products as well, but tey don't have their prices on their site.