In my idea ,It is very important to observe some rule to be successful in your presentation .first you should be very confident and be relax to be successful in your presentation then you should have eye contact with the audience  and smile .use from body languages to make clear your idea for them because body language have more useful to make clear your idea .and think you can do every thing no one is better than you .think positively and try your best .be successful in all field of your life.