Your horse sounds like a mare I had a few years ago. I'd bought her from out of state after getting an unbiased recommendation from a gaited clinician.
I got her here and fell in love with her! She was the most trusting horse I'd ever had. If something concerned her all's I have to do was talk to her and that would be enough. Wonderful ground manners..I used to slide off her rump, duck under her belly (didn't make it a daily practice, lol) and she loved every second of that kind of attention. She'd bow, lay down, no bite and certainly no kick. If I had to, I could have sat on the ground and leaned against her back legs and trusted her never to hurt me.
Get the tack out?? Whoa Nelly!! She turned into the demon mare from HELL. My dressage trainer always started any session on the longe line. She liked to if there were any hitches in their step and more importantly, just where their brain was. My mare would start out bucking, charging, galloping, just like you'd mentioned, a real B!
Once she had a brain cell it was time to ride. That mare had THE hardest time with forward...it was all backwards and sideways. I can't say I used NH methods..we just made things simplier for her. She was trained TO fight, and she did it well. So, we incorporated lot's of praise and to a good extent it worked. I ended up having to put her on Regimate <sp> because she was all over the place.
Enough about that..my point being it doesn't matter what person you watch on tv, it comes down to what's going on with your horse. If you can't get a professional out there to work with you, try taking some video and posting it. I'm more about breaking things down and seeing where the issue starts before pushing and/or demanding. That will shut her down quickly and you'll make her a better fighter. It's not all about winning, it's about getting good communication. Just my 2c...that's about all it's worth