Prayer Please

I was asked to speak at our church's mother/daughter brunch Saturday. As the date approaches I am a bit nervous. I've never spoken in front of a large croud, not that that makes me nervous, I like speaking. What makes me nervous is that my words can't be changed. Once I say them, they're out there. I can't re-word them or tweek them, nothing. Its done. When I write, I can think about what I've written and change it whenever I want. I'm suddenly struck by the weight of this task and really want every word, phrase, and thought to be exactly what God wants from me. Please pray I bring Him great glory and follow His leading. Thank you so, so much.