Great job and thanks for the information!
Personally, it's hard for me to recognize stress when I'm under it. As a result, I just try to take it easy and breathe deeply as much as possible throughout the day. I take whatever time I have to calm myself. If I'm driving in traffic, I'll use that time to do deep breathing and sort out any niggling issues. Throught the day, I make a conscious effort to slow my mind down when it's racing all over the place. I practise smiling as much as I can (sounds foolish but it works - just smile, whether you feel happy or not). I can report that I feel calmer and happier, and this shows in the skin.