 One of the best ways to get over nervousness before running a workshop is to not try to get over it. What? Really? No. Really. Don't try to get rid of the nervousness. Expect that you're going to be nervous before a workshop. Expect that you won't sleep well. Expect that you might not feel 100% and just accept that you're going to feel nervous. You're going to feel a bit afraid. And the more you accept it, the less you try to fight it. Weirdly enough, the less nervous you get. You're going to be nervous for a workshop, accept it, and believe it or not, you're going to get less nervous. That's it.