I do not have anything against NH. I use it in many respects. It is more to me a way of though then actually a way of training. I personally would not use a NH trainer however I would want a trainer who uses NH in some form. My trainer is not an NH trainer however he uses those principles when he trains. He has a very good understanding of what a horse response too and how horses move and why. This is NH. Not playing games or forming a bond.
If this trainer is a trainer who will work for you and your horse check her out very carefully. I do not care what trainer is used you must look at how they train what the end result is. Given enough time a monkey can train a horse. When I send a horse off to be trained I expect certain things at certain times. I want a good solid foundation. I do not care if the horse can play games or do tricks. I want a responsive well trained horse based on the time they are at the trainers.
Talk to the trainer watch them ride both new green horses and horses they have had in training for several months. Talk to past clients. NOT JUST THE ONES that are there now.
Now there are many other things I look for when I am looking at trainers however those things would not be available to you most likely.
More then anything you can never do too much homework with trainers.
Putting "NH" in front of it is really meaningless, IMO. Tells me no more than the word "trainer". It is SO open to each individual interpretation, it is ridiculous. Good, means good, no matter how you look at it.
I would also suggest that you spend all the time you can there watching. You will learn a tremendous amount, and you are the one who has to follow up after you take the horse home. I currently have a horse in training-some call him an NH trainer....I see him as more of an old school common sense cowboy type. Very gentle, and very slow. However, everything he does has a reason. I have spent MANY hours this summer watching him, not only with my horse, but with others and have learned a tremendous amount. I have also started riding daily when he finishes training my horse, so that I know exactly how to best handle situations, etc, to keep the horse so nice and soft, as he has taught him.
As a good trainer, he puts good basic training on ALL breeds. Makes no difference whether they are Oldenburgs, show hunters,dressage, Arabs, QH, OTTB, reining (except that IS his specialty)etc. He takes them all, and they all stay until they have at least basic w-t-c SAFELY, and softly.