Time has no divisions to mark its passage, there is never a thunder-storm or blare of trumpets to announce the beginning of a new month or year. Even when a new century begins it is only we mortals who ring bells and fire off pistols. ↗
The nerves are a problem on trumpet, because when you mess up everyone can hear it. Just remember most people are too polite to say anything about it. That should calm your nerves. ↗