Decide whether you or your horse will be the leader because someone has to be. If that's you (and I hope it is), do a LOT of round pen work, including join-up (Monty Roberts). Tons of videos on youtube. The main point of join-up is establishing trust with your horse, so that he sees you as the alpha in the "herd" of him and you. Also, learn to move his feet. When you move his feet, especially his hind quarters, you are in control. A horse's instinct is to preserve his energy as much as possible since they are prey animals and need to be prepared to escape danger. When you move his feet, you are communicating to him you are the leader. It doesn't have to be a huge movement, just a few steps. For example, when I am leading my horse to the pasture or ring, he always tries to eat and he is VERY sneaky about it. I use the word, break, and step around and use my long lead rope to tap his hind quarters. Now, I don't have to tap at all. When I say break, he stops. When I say, release, he knows he is permitted. I strongly believe in a give and take relationship and I am stern and consistent, but also reward when he deserves it and when I can.