Day 2 update - much improved!
Well, I don't have a bridle yet, so we were still in the halter today.
But I used 2 long lead ropes instead of my endless long lines, and ran them through the rings farther down on his sides - MUCH better!!!
And my friend walked along beside his head, whereupon he said, "Oh, I know THIS game!" and marched quite enthusiastically along.
We practiced some turns (perhaps a little less fluently than we might have wished, because my friend is Deaf, so when she's in front of me, I can't communicate with her - but we managed), and even walked through the low cavalletti that live in the middle of the arena a couple times.
Again, a very short session, but it was much improved from yesterday's solo attempt.
Thanks for the suggestions & encouragement :yes::yes::yes: