
Ditto.

Just relax and you'll be fine.
My best advice (and what works for me) is to forget about calling it a "presentation". That one little word can strike fear into anyone.
You probably go to lots of meetings don't you? . . . and have to explain things to people and get your point across?
Sometimes, I bet you might even stand up and illustrate a point on a flipchart etc.
And do those situations make you nervous? Probably not. Or at least nowhere near as nervous as you are about doing your presentation.
Look on it as just another meeting.
Prepare for it as you would any other meeting. Make sure that you know your subject and don't script it too much.
You have to be a bit more organised because you're taking the lead and you have some Powerpoint slides to keep you on track and give your points some structure . . . but that's all it is . . . just another meeting
It works for me.
Incidentally, I adopt the same mindset for interviews too.
I'm just going along to meet some people, learn a bit about them and tell them a bit about myself . . . just as I would if I was meeting a new supplier etc