Fortunately, I have an excellent trainer in Chemaine Hurtado, owner and trainer at Symphony Dressage Stables. When I still don't get something after she's explained it ad nauseam and then shown me with her own body - always remembering that I need to see it from the back rather than with her facing me because seriously, that mirror image just confuses me even more, she goes out and finds a video for me.
As soon as I watched this ... okay, I had to watch it twice or maybe three times, I TOTALLY got it. In fact, a bunch of stuff clicked. When I went and rode the next day, Speedy suddenly had a shoulder-in WITH ANGLE.
Speedy and I might just have a shoulder-in to renvers for the show next weekend!