I Already Know, and So Do You

I have been awake since 4am, after not going to sleep until 1. The trigger for this unrest is something I have experienced before. I feel anxious about facing my next audience.

My anxiety stems from being expected to speak on a topic uncommon for my usual addresses.  And since my topic of focus is one uncommon to me, I feel burdened with needing to get more information. How much is enough?