You need to be at your best when things go their worst.
We have all had a bad Sunday. Someone one got sick, the sound system was feeding back if you so much as breathed near a microphone. This is not the time to point fingers at your sound tech, or throw a fit when your soloist sends you a text message saying they had to go visit their kid at college. Your team is watching you, and your reaction will set the tone for the outcome. Sometimes the best solution is to pause for prayer as a team, and default to the simplest solution. Example: Turn off the sound system and gather your team around a piano to pray for the Services you are preparing for. Fix the sound system later.