I’d suggest looking into many different methods. I, myself, follow teachings of Buck Brannaman and I’ve got an OTTB that’s come a long way. I was told nothing nice about the horse, he reared, pulled back, heavy, wouldn’t load… As I starting working with him using simple methods I know, like controlling his hindquarters and forequarters. In working with him, I found out why he was doing all these things. Not to mention that no one allowed him to think his way through things. I helped guide him, making the right thing easy and the wrong thing hard. He’s never pulled back, and he’s quit rearing when put in a situation he doesn’t understand. Even trailer loading is getting better. He’s much lighter in the bridle and just a joy to be around now. Don’t give up, there are methods out there available for the taking.