Leonard --
Your starting example was a good one. Most of us have taught people to fly from time to time. Any suggestions for "instructor" training?
Naturally, I have some. First is get real comfortable flying left handed including round maneuvers, assuming you are teaching a "righty". Then, flying left handed, have the rightys hand on top of yours, take-off to level flight. Hand-off to the beginner in level flight when it seems right, sit down in the middle and watch. Learn when to overpower the beginner and when to let him / her make some (non-fatal) mistakes
The hand-off to the beginner is a key move, and I can't remember exactly, but it was something like switching to my right hand, switching back to flying left-handed with thumb and ring finger on the front of the handle, leaving grip room for the beginner. You can still over ride the beginner at this point.
Put your hand on top of the beginner's for the landing, and let the beginner progress.
Key talents are flying left-handed, flying with thumb and ring-finger for short periods, and taking some risks.
Reminds my of learning cross-wind landings in a full size 172 with a good instructor. After an ugly landing in a 19 knot crosswind, I asked the instructor, "Why don't you do one, and let me just follow you on the controls?" The instructor said, "Well I mostly did the last one except when you pushed harder than I did!" Good lesson!
Flesh it out. My memories are vague.