Yeah @vheobong, there is a way a first time success encourages our interest, lightening up a fire in us. I can tell you are so into public speaking. For me, it brings such great fulfillment I can't explain.
Yeah, the joy is overcoming "that" nervousness as it paves way to another powerful presentation.
That joy that comes from knowing you did it well the last time, so, the next wouldn't be all that difficult.