You don't need luck, you'll be fine. Its odd, no matter how hard xH and I tried to NOT be tense, we both so obviously were. My goodness, the day of the D, you could slice the tension in between us. But it wasn't really aimed at each other, just...there...you know?
You will do yourself a HUGE favor by remaining calm, even just on the outside. Afterwards, find a good stress reliever!