I guess it's not in the category of, "Bad Advice," but it could become that:
I have a friend I sometimes ski with. The other day he told me that he was thinking of teaching part-time next year at a local hill to fund his son's snowboard training program there. He said he told them that he wasn't great, but that he was a solid Level 8 skier. I later looked up the PSIA levels: I'm a weak 8 (great on hardpack no matter how steep and/or narrow but just OK in bumps and crud), and he's barely a 6. I didn't want burst his bubble, but how in hell could he possibly so dramatically over-rate his ability? Sure he can get down the easier blacks, albeit with zero style points (hunched over at the waist, hands high and far apart, leans into the hill instead of angulating, no pole plants, and skids rather than carves), but the harder blacks just plain eat him up! He's a nice guy (and he drives when we ski); I'm still conflicted as to whether I should gently dispel his obviously erroneous self-assessment. He is trying to improve and has taken lessons this year, but every time he tells me what he's working on (e.g., "I'm working on rotating my hips more."), it's wrong! He thinks I'm Stein Eriksen's doppleganger! I have given him a few 'suggestions for improvement' based on the errors mentioned above. I hope the local place sees him ski before they turn him loose on unsuspecting students!