Treat coaches and players in a courteous way. If they ask you a question reasonably, answer them in a polite way. Be firm, but relaxed. Don't be a tough guy . This is especially true during time-outs.
Some officials develop intimidating characteristics.
Don't be one of them. Don't bark . If you don't like to be shouted at, don't shout at someone else. Be firm, but with a normal relaxed voice. This technique will do wonders in helping you to reduce the pressure.