There are a lot of specific exercises that can be great tools for establishing respect, but, as NorthernMama said, it's hard to give specific advice without specific information. If you don't own the horse, it may be inappropriate for you to do any of this kind of training with him at all. If you are considering buying him, and he has issues that you need to ask how to address before the purchase, I would honestly call that a sign that he may be too much for you to handle right now without some on-site assistance. I know you asked not to hear that, but please remember to be brutally realistic about your abilities.
In general, moving the horse's feet on the ground starts a productive pattern of behavior. Get him to move his feet on your terms - whoever gives ground first confirms the submissive position in the herd. If the horse is in the habit of crowding with his shoulders, work on yielding the forehand. If the horse swings his rump to you, yield the hindquarters and get two eyes and two ears looking at you. Barging forward merits backing up. You can use the fence to start sidepassing from the ground.
Those are the basic exercises: move each part of the horse's body on your terms, and with a respectful attitude from him. The hard part is doing it with the right timing and feel for the exercises to make a difference, and that is what almost always requires on-site help from someone who can teach that timing and feel. A correction for disrespectful behavior needs to come within 3 seconds max of the behavior, or the horse will not connect the action with the correction. Same for the release of pressure - it does no good to get a little "try" from the horse, press on for more for 5 minutes and release then when the horse doesn't give again. Horses learn from the release of pressure, not its application. Reward the smallest change and the slightest try - it can be as small as a relaxing of the body at first, signaled by blinking, licking and chewing, sighing, etc.
More information about the exact situation would be really helpful if you want more than a list of possible exercises and buzz-phrase guidelines.