I am used to giving speeches and writing them for other people, and now I teach the students how to write and deliver presentations and speeches. Anyone can do it, just remember a couple of basic principles - SPEAK SLOWLY - when you are nervous you tend to speak too fast. Stop every now and again, take a deep breath, and then continue. And make eye contact with your audience from the beginning. When you are new at it, you look anywhere but at the audience. If you single out a couple of people at the start, one near the front, one near the back, and talk as if to them personally, you will get the right pace and also speak loud enough for everyone to hear. It goes without saying that your notes etc are well prepared, and you have rehearsed a couple of times, looking in a mirror is a good idea. Good luck!