Everyone learns at a different rate especially physical motions. Some are good at copying a motion others are not. I have twins, boy and girl. The girl could copy my motions and was good at school stuff, the boy, not so much. Being the dad I worked with my son a lot more than my daughter and for a time wondered whose son he really was
. Slowly but surely (we're talking years) he became better, much better, at things like throwing and hitting and fielding (baseball). To his credit he stuck with it. My daughter made all her sports teams without really trying and they both achieved about the same level of competencies. It just took my son a lot more work. When he took up golf in his twenties he actually took to it quite easilty (even though he thinks he's the shits) and I imagine it is due to all the work he put in learning the baseball swing. I've even noticed that I pick up golf motions much more easily now than when I was first starting out thanks to all the thinking and learning I've done in the past. Bottom line, I think it is amazing that golf instructors can make much headway in an hour lesson since there are so many details to concentrate on. Just getting someone to change one thing, sort of, seems to be an accomplishment. I know exactly how you feel when you try to help someone and it doesn't come close to working out. Some folks just take more time.
My two cents.