accio! chickens :
I agree completely, lowering her head is a BIG trick I am certainly going to be teaching her. It's important for her to learn this as she has a higher headset and I am NOT into fighting with a horse to get a halter or bridle on.
I was being somewhat, I dunno, sarcastic in referring to that as a trick. It is SOOOOO not a trick. It is basic communication.
And the primary purpose/benefit is sooooooo
not "to help you get tack on the horse's head more easily"
If you want reading material and written analyses/suggestions regarding training, which
is usually a beneficial thing to pursue, I would HIGHLY recommmend that you focus not on "teaching her things" but on learning how to improve your own body language. From your description, it sounds a lot like this is a rather reactive horse with whom you need to be accurate and clear and not over- or mis-state what you want... which is a very very educational kind of horse to have, but you need to be clear on who is primarily the student
There are various books and videos that will help you to one degree or another with this, if you are really attentive to what you're doing with the horse. And aside from its value in working with a particular 'problem' horse, it is sort of the basic foundation of all horsemanship and thus always worth getting better at *anyhow*
JMHO, having been there and done that and seen this sort of thing an awful lot over the years,
Pat