I often go through my library randomly and spend an hour or two in a book I have previously read. 100% of the time I find something valuable to implement or mention to other coaches. In Developing an Offensive Game Plan, written by Brian Billick, he mentions how a change in your demeanor during pressure situations could be misinterpreted by your players as you "losing your cool." Instead, warn your players that the game situation may change you a little but that doesn't mean the situation has gone desperate. If your athletes know ahead of time that you anticipate a little more "crazy" in your voice at certain points of the game, they are less likely to lose faith in your play calling abilities.