I used to keep my brother in my ear with me. He used to remind me to slow down, to breathe, to quit panicking when it got to be too much. We were wards of one of the Elders and I had to speak at these things all of the time and I was never great at it in the beginning.
It becomes easier the more you do it though. It's also easier when you believe in what you're talking about. And you won't have any problems with that. :)