Rude News from Rude Mechs: HOW TO REHEARSE.:
First, you have to hearse. That's obvious. Of course, no one teaches hearsing anymore. It's fallen out of fashion. So you'll have to teach yourself to hearse, which is how you get ready for a rehearsal, and you'll never have any idea if you are doing it right.
Second, begin apologizing to everyone who will not be in the rehearsal room, (hereinafter simply called "the room"). Those not in the room will never understand. The mania is particular each time. No one outside the room will understand the importance of the stories you tell about the room. No one outside the room will understand the vocabulary of the room. No one outside the room will understand why you want to get back into that particular room.
Third, your baby and your boyfriend and your favorite TV show are probably all outside the room. You'll miss them and two out of three of them will miss you. Pray for the right two.