“Well begun is half done”, is a tradition-based saw which has all the sense. You engage someone with your personality, behavior or deeds in first few minutes, this is the proven fact. If someone has liked your persona and character in the beginning, it’s almost certain that he would behave with you accordingly in the rest of your interactions with him. In the spoken presentation as well, you must have a fascinating start to engage the audiences then and there. You can do this in ways:
“First impression is the last impression” and this happens in presentations also. If you show in the opening of the presentation only that its core message carries a big gain for everyone and you are passionate about it, you will have achieved half of your goal definitely, then and there.