Bobski, the range is actually up in Wisconsin, a couple hours from Winds house. I don't remember the name, but Winds may. It was a convenient place to meet JonM who lives up near there. I don't think they were doing any of the games like you are setting up. They were just slinging clays with spring loaded mechanical launchers and shooting them. Seemed to be mostly kind of straight out from near the shooter, within +/- 30 deg from direct front center. Every once in a while one would go a bit more side-to-side, but mostly outwards.
Speaking for myself, the games are likely to be just a vehicle for me to try to learn fundamentals like stance, shouldering, cheek weld and other details. Hitting anything will be a bonus!
I've only been shooting pistol for a couple years. During those couple of years I've shot a handful of rifles of various calibers, mostly on bench rests with scopes at fixed targets. I have no useful experience whatsoever for shotgunning or moving targets.
I wouldn't describe my mental state as apprehension, more like anticipation. I'm looking forwards to shooting a shotgun and learning to do it reasonably well in the short time available. I've heard lots of good things about your skill as a teacher, so I have high expectations!
Aside from upper body exercises, is there anything I can do to prepare? Competent YouTube demonstrations? Shotgunning websites that can tolerate total newbies?