[TWSS]

While there is some great advice here, I don't think it's necessarily for people who haven't done a ton of public speaking before.

What I agree with: Find your power animal (the pose or gesture that feels natural/empowering to you), pick two people in the room to speak to (I prefer to pick four, only two of whom I can usually see due to stage lighting), and practice as much as possible in front of an audience.

What I disagree with: Don't "um" (it's distracting and unless you have the gravitas to pull it off, you sound like a Valley Girl), and memorization may be exactly what you need to be comfortable speaking publicly. Like another commenter, I've memorized my pitch almost verbatim, but use conversational language based on bullet points. The "script" gives me something to fall back on if I get distracted.

For context, I was a competitive CX debater in high school and recently had to relearn public speaking 20+ years later as a startup founder: http://www.youtube.com/watch?v=ClznRU8-Xfw