I hate it, too, and in this past week I had to stand up 3 separate times on 3 different days and give speeches. The first two times I didn't use a microphone, but the third was with a microphone, and I dunno it was too much. I got shaky and stuff, but Mark said you couldn't even tell.

Take a deep breath, and smile. Like Karen suggested, practice out loud -- in front of a mirror, to a teddy bear, even to your Mom or Dad.

Best of Luck!!!!!