I have a Banana/CG that is named "Bad Attitude Banana" BAB for short. He was SUPER defensive, and would strike at anything when he was younger. I never owned a defensive/aggressive snake before so I would always be a bit nervous picking him up and letting him roam around my hands/lap. Eventually he settled down and stopped his nipping, but it took months!
Your nerves might be a lot like BAB (and other nippy snakes), where it just takes time with your animal to feel comfortable.