There was an American opera singer called Dorothy Sarnoff who had the most beautiful voice but also the most crippling stage fright. If you worry about presenting when nerves kick-in, imagine trying to sing a bit of Gershwin.
It’s not always what you say… it’s how you say it. Of course, your body language tells your audience a lot (are you nervous or can they trust you?) but how you convey your content will decide whether your messages ultimately hit their mark.