What she said. Your first job is to be a good chorister -- a good HEALTHY chorister. Contribute as you can to the production in other ways, but don't stress yourself about secondary obligations. And it's very much okay to ask and check assumptions as you go. People do forget to articulate assumptions all the time.

Does your watch have a timer or multiple alarms? Do you have a PDA? You can use these devices to remember to eat (before you hit bottom) and do other self-care stuff. I speak from experience, believe me.

Oh, and w/r/t makeup -- I'll make sure to get some more of the most hypoallergenic cream base when I go shopping tomorrow. (Figured out who I am now? ;-}) Please, please, TELL ME when you have "special needs" -- you're not being a diva (divo?). Before you put on makeup, apply a layer of lubriderm or keri lotion (or some hypoallergenic moisturizer). Get some Neutrogena sensitive-skin makeup remover (or another good hypoallergenic brand) at the drugstore, and keep it for your own use. I get unscented baby wipes for the cast, but it sounds like you might do better to be really careful about what you use. I stock enough sponges so that we don't have to re-use them. I'll get some brush cleaner so that you can make sure that the brushes you use are absolutely clean, too. You aren't the only cast member with sensitive skin. There are some limits on what we can do to accommodate it, but I'll do the best I can.

Don't forget to have fun, too!