Deane, (and I don't mean to sound sarcastic), there's nothing wrong with letting someone learn things by experience, as long as you tell them once. (Anything more is nagging.)
Believe it or not, I've ignored the advice of others and found out for myself. Honest! Then I have a baseline with which I can discern which are the reliable sources.
Do I get burned sometimes? Sure. Do I learn the lesson well? Absolutely! Again, I don't mean to be trite; Dewayne, et al, may well find some long-term reliability along the way.
Larry
www.fineelectricco.com