(in no particular order)
This seems like a good idea.
These are points I should cover.
Why the hell am I doing this. I should not be talking about this topic (reasons: assorted).
Ooh break through! This is the angle I’ll take! Excited!
It’s happening so just write the damn thing.
I’ve given so many talks now which have gone well, been invited to progressively bigger and bigger events. And still. Every time.