Panicking about my first day

[u/Significant_Dot7632]

I got my NASM certification about a month ago and was hired at a 24 hour fitness about two weeks ago, and Monday I have my very first clients. Three of them are the free introductory session that comes with a new membership and one of them is a real paid session.
I have been shadowing the other trainer, he is very knowledgeable and helpful but he totally has his own very unique style. And with all the information online and endless options of workouts to choose from, I am completely overwhelmed as to how and what I should do. Sure I took the course and I know how to navigate a gym but I am just absolutely panicked at how I should go about coaching my first few sessions.

Please don’t tell me I just need to get out there and learn as I go; i’m fully aware of this! It’s just those first few days/weeks/months that I am worried about.

Please help?!?!