As long as you know your material and are prepared for it, the 100% worst part will be the before. What do I mean by that? I mean this, when you start talking and knowing what you're talking about... it's going to flow.. all that nervousness will disappear and the after you'll be asking yourself why you were so nervous when it was a grandslam.
I used to HATE it, just like JJ said about the classes and wouldn't take a class for that sole reason. One of my very first presentations at a previous job, my co-presenter came to me and said, "Remember, no one here wants to see you fail. They're here to listen to you. You are teaching them, and they're here to absorbed your information. You are the product manager, you know more about this than any of them, show them what you're capable of and knock em dead"
May sound cheesy to some, but his words still stick with me. No one especially in college is there to watch you fail, they want to learn from you, and maybe even get tips on how to handle their own presentation and control their own nervousness. Before I would never go first... now it doesn't bother me to go first and show em how it's done, or go last and know that "saved the best for last"
Not trying to sound like an arrogant jerk, but I still need to psych myself up at times and telling myself I'm the best speaker...that helps lol
And like Mentalflex said, I always do a look around and focus on serveral objects/people as I'm speaking so I'm not standing up there looking straight ahead. For the people, I tend to look for friends, or people I am relaxed with. If you don't have friends or people you can relax with in your class, MY opinion is to then look several of the ladies in the eyes... I suggest that because I personally am a flirt... it relaxes me to flirt with women... so if I see a woman's eyes... its all good.
You'll be fine. Know your material, keep faith in yourself and you'll do fantastic.
Let us know how it turned out.