For those who are insane enough to try halterbreaking a horse of this size/age, heres how I've been doing it.
Most importantly, you must have great health insurance. Or just be really careful:p. And at least slightly insane.
1)handle every day, with calmness and patience. Lots of petting and rubbing down. I started in his stall with a "carrot stick", rubbing all over, then progressed to round penning.
2) round pen as you would any other horse at liberty. Expect them to pay attention, change direction and stop when asked. Then start asking them to stop and stand to be rubbed down.
3)introduce the lead and halter. Rubb all over. Put the lead around their neck and start asking them to give to preasure.
4) HALTER. Thoroughly desensitize the head and neck. Because he is 18hh and high headed, I put a string on the poll peice of the rope halter and attached it to my carrot stick, so I could get it over his ears with out literaly standing under his neck on tip toes(I'm barely 5"5). Pull over behind the ears with right hand while standing at his shoulder holding the loop peice in my left(that you tie the pole peice to). Guide the nose peice over his nose and tie on the rope halter. Try breathing again.
Tomorrows session: Leading. The vet and farrier will be out in a week, they have both been contacted and know the situation. SO EXCITED.