Methods I use with a new or unknown animal.
1) Make slow even movements but with purpose.
2) Bites happen but should not be rewarded with being left alone or put down.
3) Hook training is also wise. Get the animal to ball up, turn, or run before reaching in.
4) Always remain calm.
5) I sit the ball python in my lap and let it sit partially covered with a towel for a few minuets relaxed and wait for them to start to move. I only intervene when they try to move off of me. This allows them to get use to my smell and learn that I am not something to fear.
6) Keep introductions to short period of times.
7) Repeat till you both are comfortable with the experience. Over time trust is built up.
8) Never handle the day before, the day of, and day after feeding.