Discipline needs to your first concern. You must be able to determine when discipline becomes abuse. Young horses have short attention spans. Your corrections must be done immediately of bad behavior. To do so later would defeat the purpose as the horse wont understand as be interpreted as abuse.
Be patient and take it one step at a time for your safety and the horse's. Always direct yourself with authority and a clear loud vice. Work begins the moment you catch the horse in it's stall or paddock.
After lunging, this is the next step. Tie the horse with about 6 inches of play between the halter and post. Get an empty feed bag or an old heavy shirt. Stand near the horse so that you can reach it with the object that you havein your hands. Do not stand so close that if the horse moves around you do not have time to move away. Proceed to sack by gently swinging the bag back and forth touching him in different parts of its body. The horse may make all kinds of noises and rear around. Every time the horse has stopped its reaction, stroke him with the bag. Do this from both sides and again to every part along its side and legs. ON his head, only gently put it over the face and ears. Slowly remove it from the head.
After all of this has been accepted, do the same all over but this time do it gently with your bare hands. Still maintain a position so that you can move away easily. Then untie the horse and take him back to the stall. (recap from page1)