@climbingbetty - back to the topic you asked about......
L1 is a lot easier than what you have in your head. Study the manual and possibly the Children's program before you take it. They expect you to be able to ski open parallel on black with basic skills, and to be able to demo and teach beginner skills like one-ski and flat-land ground work, riding the magic carpet or rope/chair, the bull-stance turn around, sidestepping, straight runs, gliding wedges, wedge stops, and possibly starting parallel turns, depending on how your ski school or division is set up. If you can demonstrate all those coming toward the class and going away, demonstrate basic safe class handling (like having each student stop below the group to avoid the domino effect), and explain why and how you do each maneuver, you'll do beautifully. It really is the most basic certification and they try to make it easy to achieve, both to build up confidence, hook instructors into the program, and to bring in $$$, of course.
Speak clearly and loudly, keep moving as much as possible, and have fun! You'll be just fine on this one.