I've had my bikini line waxed for years and it still stings...I just know not to go when I'm PMS'ing...rather just after Aunt Flo is best.
But as far as facial/brow waxing, I'd go to a professional first and get some advice on how to maintain following her treatment. And, I agree with the others to not have any specific committments just after a facial waxing...
I had my brows waxed and tinted for the first time ever a few weeks ago. My skin swelled up so dramatically after getting rid of all that brow peach fuzz that I had to wear my sunnies, at night, into the grocery store right afterwards, and my brows didn't hurt but were still swollen for 48 hours or so. Glad I did it on a Friday so I had the weekend to recoup!
So it was awkward, in the grocery store in sunnies, but I just held my head high like I was a celeb, LMAO.