My first public performance I did a little routine where I take a randomly selected card from an unmarked deck and via bending and flexing it I "read" the stiffness of the ink with my fingertips to identify the card. This went well.
I then did a KC routine, nothing special. This one taught me to really develop patter because without patter the performer and the performance stands nude. The difference between "I want to show you something" and "I'm like fourteen times smarter than you are" is paper thin and it pays to be showing instead of showing off.
I finished with a Si Stebbins trick and wrapped it up. Thanked everybody for watching me and for being such a great audience and walked away. If I'd had a mic, I'd have dropped it. I expected more out of the KC routine but I realized later I was too smug about it.