Cushion Plumper, just because people can hear you, doesn't mean they can see you. Blame it on the kids ;-)
I'm a make up wearer / worrier & have recently got the camping bug. I got a camping mirror from the 99p shop (why its any different to a normal mirror I don't know!). There's usually something to hang it from in the tent. As long as you've got your make up wipes & a mirror, you'll be fine.
As for tips; a head torch is useful if popping to the loo at night as it leaves your hands free.
I cook & freeze pasta / mashed potato / cooked veg & take them out last thing for the cool box. Also a 4 pint of milk is brill for keeping everything cool as well as lining the cool box with newspaper.
Bearing in mind we've only been a couple of times, its amazing how fast you pick it all up.