I worked with a rather large pair of bar necks about 20 years ago. Pictures do not do them justice. Their scales look like velvet with the iridescence of a brb. The pair I had were not defensive and I only got bitten one time. It was not a fast strike either. He was resting on my arm and shoulder. He casually moved toward my other arm like he was going to climb on it then opened his mouth slowly and clamped down on my forearm then released it just as quickly and went back to his normal self. I had little tissue damage, just pin holes but I did end up with some nerve damage below the bite in my wrist and hand that took quite a while to heal.
All in all they were impressive and beautiful snakes. I ended up getting out of the hobby toward the end of college and donating them to a local zoo that was going to use them in one of their daily programs but I heard they were stolen. I am fairly sure mine were WC so I would assume if you could get a youngster WC or a cb neo you should have no issue making them manageable however I would always treat that particular species with respect.