Yeah public speaking is hard. I'm terrible at it. One thing I might suggest (other than the suggestions already given, which are all good) is to write it in such a way that you can involve, read, direct the attention away from yourself and onto, other people. Example: "Blah blah blah and I remember how Tom - hey Tom! I see you sitting there squirming. You think I'm gonna tell them all about how you kept your teddy bear till you were 30, don't you? Oh I would never do that! Tom, everyone!" (Pause for nervous laughter, applause, catch your breath as the attention slowly swings back to you). "Now, Tom may have kept his bear but Sally, on the other hand..." and so on. Pushing the attention of the crowd to others (nearly wrote crows instead of crowd - hey! There's an idea! Release a murder of crows into the audience! That will take the attention off you and distract them while you make a hasty, pre-prepared escape!) might help relax you, and also eat up time.
Like I said, I suck at this.
