Putting on a show is about lots of elements and people coming together into one (hopefully) brilliant whole. It can be amazing to watch whether you have a big part in the process or not.
However, this is also a ridiculously stressful experience.
I double check if I packed something, or noticed the right rehearsal time, constantly. In fact, I triple and quadruple check. I went to rehearsal once when I knew full well it was canceled just because I was afraid that I might have gotten the wrong message and would miss it instead.
Eventually, there comes a time when you have to let go of those kinds of preoccupations and just let it all happen.
For me, the only time that I ever manage it is a show night, when I'm on stage and that second long "Oh crap, what's my line?" moment during the line before mine is over, and then performance is really on.
Everything moment between that one and the day I auditioned has the potential to be terrifying, because no matter how many classes you've taken, or tips you've read, or shows you've done, there's only so prepared you can ever be.
That said, I've made a checklist of things you should always have or be doing whether you're in the middle of a show or about to audition for one.
I have either done posts relating to these things, or will do them shortly. I'll link them on this post.
The checklist is as follows.