Speak to one person at a time
One of the most terrifying things about public speaking is the crowd. Just by looking at the crowd, all in silence just to hear you speak, will send shivers down your spine. To overcome this, you just need to speak to one person at a time.
Choose one member of your audience and dedicate your whole presentation to him or her. Just assume that everyone else is not paying attention. When someone asks you a question, change your focus to that person and answer the question as if the two of you are in a coffee shop chatting away. Isn’t that the most relaxing way to handle a crowd?