OKAY GUYS!!!!!!!!!!!!!! I did it, on the lunge line.
It was so smooth, like it felt as though I wasn't on my horse.. I was just flying. Then we came back to his trot and it felt smoother than usual. It was a lot of fun, but I'm going to stick to only doing it in lessons until I can handle him off of the lunge line (he likes to duck into the middle as evasion.)
Thanks for all of the support!! He has such intense power in his hind!
I'll try to get pictures or something-- soon-- of the endeavor!