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.
When I work a game as an analyst, all I do is look at the game like a coach. Why was something successful? What makes it work? I just try to use my expertise and whatever insight I have to the game.
Sacrifice, discipline and prayer are essential. We gain strength through God's word. We receive grace from the sacrament. And when we fumble due to sin - and it's gonna happen - confession puts us back on the field.
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.
No matter how bad someone has it, there are others who have it worse. Remembering that makes life a lot easier and allows you to take pleasure in the blessings you have been given.