Actually, for me, if I think too much about what I want or need to say, I will have a hard time getting through it. When people say "just think about what you want to say" or practice, it's the worst thing I can do. It is because certain words I might have a hard time with, so it messes with my head. When it comes to doing a promo on a live microphone, I have bullet points and then I just let the words flow naturally. I would be more intimated by someone's handing me a piece of paper and get told to say exactly this over someone handing me a microphone and asking me to talk about something on the fly. Weird how our brains work.