Eureka!
Much better this morning.
I decided to imagine I was wearing a lap belt, low across my hips, as one would in a car. And I decided I'd just accept however fast Quanah wanted to go at the transition and worry about slowing down later. Because if I were wearing a seat belt, I could just stay with him until he slowed to the proper gait, right?
The first time I asked for trot, I got the opportunity to ride a few strides of canter
(which I'm not supposed to do yet - RI's rule is one must master sitting trot w/o stirrups before cantering) but I kept my hands low and quiet and just accepted what he offered. And
then asked for the nice slow trot that I wanted.
And I got it.
As it turned out, the little bit of canter was a good thing - RI decided that since I could manage a few strides of an unplanned gait that we could
work outside today. So not only did we master the transition, we got liberated from the indoor.
Thanks so much everybody for all your support and encouragement. NR is the best.
ETA: Oh, yes, I am asking with my legs. And Quanah is very responsive, so when I ask a little more forcefully than I mean to, I get more of a response than I expect.
Maybe my lap-belt image helped me to use my core more today - RI said it looked very controlled once we got going (as opposed to last week, when I looked a bit like a goose tied to the saddle.
).