Negative self-talk

As part of my new job responsibilities, I am required to facilitate both individual and group therapy on a daily basis. I have never led a group before (besides the embarrassing attempts during my undergrad internship) and so I am extremely nervous about this expectation. I have been sitting in while my fellow therapists lead groups for almost the past 2 weeks so I am not going in completely blind but still, I am freaking out a little bit.
The part that concerns me is what topic to choose, the fact that all clients will be focused on me, and I will have to be assertive and enforce consequences when clients break the rules.
For the past several days, my anxiety has been mounting over this upcoming task. Until this weekend when I rationally examined the situation and took a close look at the biggest problem that I am facing: my negative self-talk. With all of these negative and critical thoughts I have been feeding myself, I need to watch out for the self-fulfilling prophecy. Ever since I came to that epiphany, I have been doing something much more productive: researching tips on how to effectively facilitate group therapy! 😉 I got this; I never should have doubted myself. Oh ye,  of little faith!!!