The best way in the world to advertise is to get somebody else to run around with the name of your product on their person or showing it around somewhere and not only that but they're paying for it. ↗
If the pressure is getting to you, whistle. In a barely audible way. It's the best way I know of to let go of tension. Music gets your mind off the situation, and the act of whistling melts the tension out of your body. ↗