As a speaker, you should never attempt to sound “professional” or like someone else. Develop and use your own voice. Being yourself makes it easier to relate to the audience and, more important, easier for the audience to relate to you. Enjoy yourself; your listeners will pick up on any discomfort you are feeling. Confidence and enthusiasm are crucial; without them, you almost guarantee that your listeners won’t connect with you.
— Adapted from “Best Quick Tips for Public Speakers,” halife.com.