I did the whole touch them first before picking them up thing when I first got him too (saw it in a youtube video). Honestly I don't think it helps or hurts at all. He's going to be flinchy about some weird giant touching him or picking him up. When I would pet mine when he was still pretty new to me he's squirm/move wherever I touched him. Now he doesn't care. Just don't pay much attention to his flinchiness and just pick him up. He'll get used to you eventually and learn you're not there to hurt him.
I have yet to be bit, but everyone says it's really nothing with ball pythons, especially when they're young. From reading it seems like it's just the shock that they did it, not the actual bite, that scared them/made them jump. I've seen one youtube video with the latching on but haven't read anything around here that that happened to. I wouldn't worry about it. I would just keep relaxed, unwrap him tail first, and wait for him to let go. I seriously doubt that will happen to you though.
I used to be very nervous about being bit too, but he's never given me a reason to think he would (over excited feeding response excluded). Honestly just don't worry about it. If you're nervous your liable to make him more nervous. I look back and think about how silly my fear was. When I got him in the mail I sat there working myself up to touch him, then working myself up to grab him. I had never handled a snake and I was so nervous about being bit. Seems silly now. You'll feel that way too later on.