The ability to act in front of a bigger group of people is one of the most desired skills among people interested in self-development. It's because we perform all the time—not only during presentations, business meetings, or training but also in normal everyday situations, like when we meet up with our friends.
Prepare the material, but do not memorize it.
Get rid of stage fright.
If possible, come to the place of your presentation much earlier.
Clear your mind before getting on stage.
Take care of your posture.
Remember facial expressions.
Modulate your voice.
Look people in the eye.