#1 – prepare as though your job (as a preacher) depended on it. Pray! Avoid too much intellectual bent.
#2 – give Jesus the wheel. There must not be fear in letting the Holy Spirit speak…nor in getting out from behind the púlpit 🙂
#3 – keep your audience engaged. This is done by showing you care about them and their souls. You’re not there just to scold them.