You will do just fine, start with a simple nine patch or rail fence so you can see what their abilities are, perhaps they will not be so overwhelmed and they will return, the beauty is in the beholder, I am a long arm quilter and I really get some bad quilts, but the families that receive them love them. My friend and I have thaught stack n whack three times and are going to do it again in June this year. We only take 10 at max for the class, then we will do a demo on Saturday at the expo. we are not professionals but the ladies love us.
Jean