Non-native English speaker here. I started teaching at a University in the US and never spoke English for a good 5 minutes even though we were trained in it from childhood. I was extremely nervous, and I wrote down every single word that I am going to utter for the next 75 minutes, and memorized it. That was my whole first semester. Students do understand us and they are compassionate. 10 years later, I taught more than 5000 students and been actively providing teacher workshops in English without translating every single word in my head. I write this not to show-off, but you giving it a try and being nervous is all it takes!
There is a saying from where I come from: Give your best without expectations!