I drove my mom crazy because I refused to let her send my young horse off to a trainer to "get his training out of the way." For me, the only reason to buy a young, untrained horse is so that I can do the training. Therefore, I would settle for no less than being right there at the lessons, and I was blessed with the perfect situation, exactly what I wanted, which was basically to be trained to train my horse. That's how I like it. I won't condemn someone who sends their horse off, there's no reason to condemn them and I admire those who can decide when they need to step down and let a more experienced person take the wheel, but I personally would not do it unless I could at least go and watch them work with my horse.
I would never, ever send my horse somewhere without going to meet the trainer, seeing them work, seeing what they turn out and hearing opinions on them and their facilities. Plus, I would require them to be open to me visiting and hopefully allowing me to interact. I also feel that whoever trains a horse leaves something with them, and I also want to understand the training so that it's not wasted when I get them back. I wouldn't want to change things even minutely with a horse that literally just learned those things.
My 14 year old sister just recently tried to take charge and send her 3 year old off to training (I don't know why my mom let this happen) and, after telling me that I was stupid and that she "knows how to do research" (which apparently consists of looking at a website, not talking to the trainer, asking questions, going to the facilities, etc like I told her to) we sent her off to a woman who told us that the horse was a menace, who bit, kicked, and was so dangerous that we should just send her to auction and get rid of her because "she would kill one of us kids" if we took her back. She then proceeded to let her student sit on the head of the horse (that she was trying to make us buy to replace our "witch," who was supposed to be 4 but had a body more like a newly turned 2 year old), and make the horse lift her up to slide onto her back. The first time she tried, the horse lifted her head when she swung her leg and the girl started yanking on her mouth and aggressively backing her up like she had done something much worse than not want to lift a 90 lb person by a neck that looked too weak to hold her own head up.
Afterwards, while we sat listening to this woman tell us that horses are stupid livestock and should be treated as such and how fantastic she is and how qualified etc. etc., the horse, who was tied next to us, pawed and tried to scratch her head. The lady then looked at us and said, "uh oh, now she's going to get another hour tied up, so she learns to behave herself at the post."
We then walked over to my sister's horse, who was also tied up, and watched her elbow her in the face because she turned her head to her. Being that she was tied to a hitching post with about a foot and a half of slack in her rope, she almost fell.
Now, this horse is definitely not dangerous. Very spoiled, yes, in need of a nice firm hand to counter all the spoiling my sister has done, yes, not a horse to let my little inexperienced sister work with, but as dangerous as this lady wanted us to believe? Absolutely not. This all definitely enforced my requirements for sending my horse to training, to say the least.... The whole way home, I almost peed myself trying not to smack my sister in the head and tell her "I told you so!"