When I got bit and wrapped, I decided to just sit there and take it, until the ball let go and unwrapped itself. I just put my hand down on a table and relaxed. It took no longer than 5 minutes and no damage was done on both our parts. Struggling to take it off might break some teeth, take longer, and cause the snake to squeeze harder.
I regret the day this happens with my girl. Due mainly to the fact that she's a yellow anaconda, and i'm sure has a stronger squeeze. Then she will also have some size.