As a coach I make lots of mistakes.
But by far my biggest mistake was not contacting any Admins when my opponent for a tourney kept being a no show. He would tell me he would be on certain days and times and never appeared when he was suppose to. By me not contacting an Admin I ended up loosing in a dice off. Which to me really sucks because he didnt earn the advancement and never even tried to earn it. i think he took the cowardly way out. So please all coaches dont lay back and expect a coach you havent dealt with on a regular basis to be man enough to stick to his/her word, because chances are his/her word is worth absolutely NOTHING.