Well, I've been a quick-changer multiple times before at local community theaters around here, and (at least in my experience) mostly you hang around with the costume rack and help the actor make his/her changes in time. It sounds weird, but actually, just having someone there holding your shirt to slide in to or able to crouch down and tie shoes while the actor buttons up can save SO SO much time.
I did "Little Me" a couple years back and was in charge of the female lead's attire. She had no less than 2 DOZEN costumes- at least a third of those she had to be in to in less than 30 seconds!
*~* Every time you double-post, God kills a kitten. *~*
Kay, the Thread-Jacking Jedi
Quando omni flunkus moritati (When all else fails, play dead...)
"... chasin' the music. Trying to get home."
Peter Gregus: "Where are my house right ladies?!"
(love you, girls! - 6/13/06)