I've enjoyed more than a few hours with folks who were trying to improve their casting in some way. I realized long ago that I can not teach anyone to cast or improve any ones casting. They do that to themselves. I do take very seriously my role as an observer and to point out ways which may make line control better for them. To allow anyone to practice poor casting habits would be a bad thing and I try very hard not to let that happen, but to offer suggestions as soon as possible. Often it will be some seemingly very small element, that when changed, will make a very noticeable difference in the final result.