Just a couple of things to NOT do on your wedding day...
-DON'T forget to take all your regular prescribed meds (if applicable)
-DON'T forget to eat while getting ready, during the day - I mean, it doesn't have to be a porterhouse or anything - but for breaky-- maybe some toast or pancakes, water, eggs, -- warning---> this is not the time to start experimenting with huevos rancheros if salsa does tumbles in your tummy ;-)
DON'T smoke in your wedding dress before the ceremony - if you need the blip of nicotine - smoke outside, away from your dress - you don't want to risk burning a hole in your dress, and your dress shouldn't smell like smoke as you are hugging your loved ones ;-)
DON'T forget to b.r.e.a.t.h.e and just let it go - enjoy your wedding day and trust that everyone you hired will perform just as you envision.