Don't take the word of the instructor as gospel. Do what you are comfortable with and what works for you and your dogs. And, if at the end of the day that means finding a different instructor than don't feel bad about it.
Bring a variety pack of the most amazing, delicious treats (and/or toys) for your dog. Hot dogs, cheese, deli meat, pull out all the stops! See what works in a distracting, sometimes stressful environment.