Bally pythons are actually quite docile, especially when they're captive bred. Most of the time they'd rather curl up tightly with their heads tucked underneath, rather than trying to bite you. I guess if he WERE going to bite you, he'd be in the "S position" (i.e. his neck will be in the shape of an S and he'll be tense). That's just how mine looks right before attacking the rats I feed him anyways. I don't know how long ago you got him, but hopefully you gave him some time to adjust to his new home before starting to handle him. You should make sure he has at least one hide in his tank so he can feel secure, and a water bowl large enough for him to soak in. As for feeding, the general rule is that you feed a rat that is no larger than the "widest" part of the snake. I feed mine at night or in the late evening since they're noctural and will be more active then. Mine is also eating live rats, which is bad because the rats can often bite, but I'll be switching him over to f/t this summer when I have more time and patience. That is something you'll wanna think of doing as soon as possible because it'll be easier. I usually take out his water bowl (so he'll have more space) and I drop the rat in the tank. Since you're feeding live, you should ALWAYS be there to supervise because as I said, sometimes the rats get a little nippy. I wouldn't leave the rat in there for longer than 20 minutes. If he's not interested after about 20 mins, take out the rat and try again the next day.
One thing to expect is that they are notoriously picky eaters and will go off feed for extended periods of time. This is normal for Ball pythons and you shouldn't worry unless he's losing a lot of weight. Mine is now on his 6th week of fasting...it happens. Another thing to keep in mind is that over handling causes stress (which can also result in not eating).
Sorry for rambling, I feel like I just wrote you an entire book, lol I just absolutely LOVE these snakes!! If you make sure to keep the temp and humidity in the correct ranges, provide the hide and water bowl and give him enough time to adjust to his new home, you should have no problems at all 
I hope that helps!! If you need anything else, feel free to e-mail me! (misshyde31@aol.com) Also, this is a good website http://www.kingsnake.com/ballpythonguide/index.html GOOD LUCK!!
-----
Cindy :-D