just remember:
If you make a mistake - that's your interpretation of the song
If you make the same mistake twice - that's improvisation
If you make it three times - you're playing jazz!!!!
And, if you DO make a mistake, don't smile, cringe, nod, or show any emotion, and no one will notice you have. That's why husband and I play as a duo, when one of us makes a mistake, we will look at the OTHER person with a "what did you just play?" expression on our face. Of course, it is ALWAYS husband's fault!!!!