Practice and rehearse

You may have a fantastic story to tell, accompanied by an excellent slide deck, but the delivery is where it matters most. Have you ever wondered why Steve Jobs’ presentations were so good? Practice — he was humble enough to practice.
If you prepare well before the presentation, you will feel more relaxed and confident while presenting, and it will also improve your body language.
Implement practice into the process of any important presentation you will give. Practice could include rehearsing in front of a crowd, taking notes, experimenting with delivery, timing yourself, or recording yourself. All things that will help you perform and deliver significantly more convincingly. Any kind of practice is better than no practice at all.