There are many “tricks” to get over fear of public speaking but the things that have made me a very effective and engaging speaker are not on many lists of “tricks.”
First, be prepared. I highly discourage memorizing speeches or presentations. You need to know the material and only try to remember 3 or 4 main points you want your audience to know. Then just talk to them and share your knowledge and expertise.
Second, remember that they are there to hear you. You are the expert and they want to learn what you have to say.
Third, be confident. If you aren’t feeling confident, fake it until you make it. If you act confident and act like you are in control, you will begin to feel confident and less fearfull.