Addicted Brain

My supervisor is on vacation this week, therefore, I was asked to teach the Addicted Brain complete with powerpoint to a bunch of interns in the gym with a microphone and projector. I went over the facilities powerpoint though I have my own which I teach the patients. I feel very intimidated. I know I have a strong background in science and recently acquired a strong background in addiction, but to teach interns? Lord, help me. Hopefully, I will not stumble over my words.