Nerves
Most speakers are a little nervous at the beginning of a presentation. So it is normal if you are nervous. The answer is to pay special attention to the beginning of your presentation. First impressions count. This is the time when you establish a rapport with your audience. During this time, try to speak slowly and calmly. You should perhaps learn your introduction by heart. After a few moments, you will relax and gain confidence.
Audience Rapport
You need to build a warm and friendly relationship with your audience. Enthusiasm is contagious. If you are enthusiastic your audience will be enthusiastic too. And be careful to establish eye contact with each member of your audience. Each person should feel that you are speaking directly to him or her. This means that you must look at each person in turn - in as natural a way as possible. This will also give you the opportunity to detect signs of boredom, disinterest or even disagreement, allowing you to modify your presentation as appropriate.
Body Language
What you do not say is at least as important as what you do say. Your body is speaking to your audience even before you open your mouth. Your clothes, your walk, your glasses, your haircut, your expression - it is from these that your audience forms its first impression as you enter the room. Generally speaking, it is better to stand rather than sit when making a presentation. Be aware of and avoid any repetitive and irritating gestures. Be aware, too, that the movement of your body is one of your methods of control. When you move to or from the whiteboard, for example, you can move fast or slowly, raising or reducing the dynamism within the audience. You can stand very still while talking or you can stroll from side to side. What effect do you think these two different approaches would have on an audience?