It sounds to me like someone else is actually in charge of the class and that person will be doing the actual curriculum. Is that right?
If so they need you to participate with the kids like a teacher's aid. Because I don't know the curriculum I can't be specific about what you can do. Perhaps you could actually dance with the kids paying attention to specific children. Dance with them when they are seeming to lose interest or need help. That sort of thing.
Use the calm, serious voice that you've developed with your own children to help keep the students on track. Notice who is goofing off, go close to them and look them in the eye. Pay attention to every girl during the time you're there. Get to know them and allow them to know you as a teacher's aid. You've now become a professional person in their eyes. Praise them, talk with them or listen to them during, before and after class. Don't try to be one of them. Be a "mother" to all 4 girls.
Start out knowing that even tho you don't feel qualified you are the one with the opportunity. I'm a big fan of "act as if you know what you're doing" or "fake it until you make it" sort of philosophy. A positive, interested attitude goes a long way in gaining co-operation from others. You can be honest about the fact that you don't know while at the same time seeming to be confident that you can learn. I say seeming because inside you may be the very opposite of confident but no one will ever know that you lack confidence while you're faking it. :):):)
I started my adult life as a shy, scared kid. I chose to teach. My college instructors were quite surprised that I was a successful student teacher. In class I rarely raised my hand or volunteered to be involved. I was the student who wasn't noticed in the group.
Once I was in the classroom I had to be in front, the one talking and guiding. I knew the material. I knew I could teach. And I did by "faking it." I pretended that I was confident. I ignored the butterflies in my stomach. Over the years my confidence increased to the point that I became a very outgoing, outspoken person. My current friends would not recognize that shy college student of years ago.
Goals could be to get to know the instructor and his/her goals for the class as well as what it is that they actually want you to do. The teacher should be able to tell you specifically what they would like for you to do.
Get to know each girl and why she's in the class. By doing this you can help them to focus by using language that they understand.
You will do fine! This is an opportunity for you to increase your skills and your self-confidence.
