Definitely get a horse that has a bit of education. You qre very correct that unbtoke babies can be VERY dangerous, especially if you haven't had any experience training. You really have to understand what the horse is telling you, else you are looking to get hurt. Young horses are quick and unpredictable, and are still learning their place. If you don't know how to listen and communicate, you could end up with a nightmare.
Horses adapt fairly well. I would suggest getting a horse that is good to ride anf knows his job, and work on him with the tricks. That way, if you fail, you still have something you can live with and use.
Also, when the time comes to teach whatever horse you get your tricks, if he doesn't learn, it will not be his fault. Trick training can be very difficult.
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