You always have to prepare for the obstacles that are going to come. Consequently, when they do come, it doesn't affect you mentally near as much as when you're unprepared for them.
I'd say handling people is the most important thing you can do as a coach. I've found every time I've gotten into trouble with a player, it's because I wasn't talking to him enough.
In the nineties, everybody wants to talk about their rights and privileges. Twenty-five years ago, people talked about their obligations and responsibilities.