The first time I went to a vet call on a miniature (falabella) farm was one of the few times the doctor/my father spoke to me to prepare for what was about to happen. His exact words were "be careful, people think that because they are little the can't hurt you. So, they spoil them and they are just the right size to kick you and take your knee out." The only other time that he warned me like this before a call was when I was like 10 and we went to my first uterine prolapse (his exact words were "this is going to be really messy"). So, don't mess with miniatures, they ARE HORSES.
My advice, find a trainer and quick. Falabella in the area of New England are popular and no one wants to train one for free. Why risk getting hurt by a horse for free? Correction, no one who is worth having them train your horse is going to do it for free. The American Miniature horse association has some resources and there are a few large farms in the New England area. I would seek them out and ask for recommendations. Its a horse, not a dog he does not belong in the house. Stick to teaching him trick and letting him be a horse.