There are two rules I want you to remember about using the microphones. Rule number one is to forget that you're wearing a microphone. Rule number two is to never, ever forget that you're wearing the microphone. Let me explain what I mean, because you're all looking at me like I'm crazy.
First, in terms of singing and projection, I want you to forget that you're wearing a mic. The microphone is NOT a substitute for projection. I can only put out of the sound system what you put into it; if you give me a weak sound, all that will come out is a loud weak sound. If you give me a nice strong sound, though, I can make it so that everybody, even in the very back row of the theatre hears you perfectly. So sing like you're not wearing a mic.
That said, as far as being physical goes, don't ever forget that you have it on. Don't sit on the transmitter, don't run a comb through your hair with the mic in, or anything else that could possibly damage it. These mics cost more than you make in a month if we have to replace them, so let's try to avoid that! If you have choreography/stage business issues that the mic might get in the way of, let the stage manager know, and she'll let the choreographer, director and I know, and we'll either figure out where to put the mic so that it's out of the way, or how to tweak things so that the mic won't get hurt. Just make sure you let us know before something gets broken.
So, now that we've got that out of the way, if nobody has any questions, let's do this thang!