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.
The answers to these questions will determine your success or failure. 1) Can people trust me to do what's right? 2) Am I committed to doing my best? 3) Do I care about other people and show it? If the answers to these questions are yes, there is no way you can fail.
You've got to have great athletes to win, I don't care who the coach is. You can't win without good athletes but you can lose with them. This is where coaching makes the difference.