I have a 13 month old colt, when he was younger I would have to be a little rough with him. When walking from one place to the other he would want to side step, turn, walk ahead of me, etc. I would jerk (hardness would depend on the extend of his behavior) down on his halter to get his attention. This worked rather well. Now I very rarely have issues with him. I have not shown him yet, hopefully next month...will let you know how it turns out.
Hope this helps.