My articles talk about it, too. Find a way to minimize variables and you'll shoot better. I just did 13 shooting clinics in Minnesota, from July 23rd to August 2nd. They went very well, though the heat and humidity were record-breaking and very uncomfortable. The kids, from ages 9 to 17, were very attentive.
Shooting is a fascinating skill to everyone in the game, especially the young players.
And my demonstrations, though they can be impressive, don't make much of a difference either. My guess is that a demonstration by a peer has more value than something I do because the students can relate to someone their own age better. I've been told that young children at a playground focus most strongly on the kids who are just a little older. In regard to learning, the only thing that really makes a HUGE difference is the direct experience of each student. Parents' words do not help.