Don’t be nervous, be well prepared. The more prepared you are the more relaxed.
I would push out the agenda out a day in advance, so folk can see there will be a quick 5m of introductions, stating who they are and what their role is. Also have the agenda printed out for when they take a seat.
Smile and keep your head up, show confidence.
I would recommend you practise 5 or 6 times, get a couple of folk together and do a test run, or get the old teddies out and practise on them, may be not.
Your intro needs to be spot on, and you must go first and then go around the table clockwise or anti-clockwise rather than a random selection.
Also greet the folk as they come in.
The more relaxed the better.
Best of luck, I hope you smash it.