There are two types of speakers: those that are nervous and those that are liars.
There are steps you can take to help reduce your nervousness, the following tips will just help to get rid of those last-minute nerves.
If you are nervous, you may find it helpful to learn the first few lines you deliver. Consider starting off by thanking the person who introduced you and greeting your audience, this will allow you to launch yourself into the talk with a few simple words before moving on to the technical stuff. It will also relax your audience and make them warm to you. If you are still nervous, don't worry - you're not the only one! In fact, the most common phobia for adults is public speaking. If you are worried about presenting, the following task may help.
1. When you have some time and space to yourself, practice your presentation again - don't worry about the timing for now.
2. At the end of each sentence, take a big, long, exaggerated deep breath.
3. Practice going over your presentation adding in conscious breathing space. This will both slow you down (when we are nervous we tend to talk faster) and calm you down. The result will be a much calmer presentation and the impression to those in the audience will be that you are a much more confident speaker.
Another tactic to help ensure that your presentation runs smoothly on the day is to make a list of everything that could go wrong, and create a plan of how to deal with each problem. Then, if something does go wrong, you will be well prepared to deal with it.