I've taught a lot of beginners. While you want them to know that measurments are important, if you make quilting fussy and stressful because you are dealing with 1/8" the beginner will give up and not want to pursue this hobby. I learned to teach people who have never sewn before how to quilt using the Quilt In A Day log cabin. All they have to do is sew straight lines. I would cut the last log 1" larger so that we could square up the block and the blocks would all go together easily. We'd use a 5 oz bat and tie it. It's fast and the beginner gets a quilt finished with little hassle. As I learned from my years of teaching children, you need to make the first step simple and easy to do.