[prerok]

Could not agree more. I also taught for some time and generally had good results, almost everybody "got it".

There was one person, though, that I just could not get anywhere with. Even after several private lessons. Turned out that somehow she convinced herself that she will never get it and never be able to progress. Even if she did get it right one week, the next week was as if that never happened. I found no way across that barrier :(