first thing i would do would be hand feed him, make sure he sees you putting the feed in the bunk or where ever, tells him your there to help and care, not to hurt. As far as actually halter breaking i like tying him to a fence or pole and walking away (not so far where you cant see him) but just far enough he knows your not right next to him. then after he calms down a bit put a little feed in front of him, if he starts eating come on to him slowly and scratch his back with your hands, keep doing this and everyday put your hands on more parts of him (working towards belly and brisket) talk to him and dont be forceful or get mad through all of it. if he starts freaking out when you come back up to him walk away, tire him out. If he is really looking like he's gonna do damage to himself i would just get an old halter and get it on him and leave it on him for about a week, 24/7 he'll get used to it and when he steps on the rope itll teach him tension means stop.