1. Always say yes to free water
  2. Don't wear too much perfume or jewelry.
  3. Pee before you walk in, preferably in a bathroom far from the person you're meeting.
  4. Don't fart.
  5. Don't cry.
  6. Wear deodorant. Even if you "usually smell fine."
  7. Smile.
  8. Be complimentary.
  9. Don't talk too loud.
  10. Do talk, though. Listening is only half of conversing.
  11. Wipe your nose with your left hand. Shake hands with your right.
  12. Smile. Again.