Practice your presentation. Practice it so much that you'll be able to say everything without notes. Nothings worse than not practicing enough. I had a speech to do in front of higher ranking officers and enlisted personnel at my graduation for AIT. I had a few blocks at the beginning but I managed to stay 90% fluent throughout the rest. I practiced so much I could do the speech again without looking at it. And take a deep breath and calm yourself down before speaking or you'll be more nervous when you stutter. Its going to happen so accept it now and prepare for it.