I love teaching - especially beginners or kids. I found the trick to be keeping it simple. You want them to finish whatever they are making. So depending on the time allowed, one completed block is ok. Then they can continue making blocks on their own or show them how to attach it to a tote bag. Schedule a later class for the continuing work. Too often a teacher will want a bit to much or not take into account the level of learning ability of that class. You can always add more if they are fast learners. I get so much from my students, it is what keeps me 'juiced'. I feel that working with folks just learning keeps us focused on the process thereby improving our work and keeping it fresh. Think about the feeling you get when a difficult block comes together. Now, picture students getting that same look when you have showed them how to take some random pieces of fabric and make a completed patterned block! It is such a great feeling.