I've probably made 20 of the Stack and Whack (triangles and rectangles)...I found that the easiest way to get fabric to match was to use heavy thread (button/carpet)...and run your needle down through all 8 layers, and knot tightly....a little more time...but means your fabrics don't slip when you arotary cut them...If you follow the directions...IMO it's not hard...taught a couple of classes on how to make one...and had very novice as well as experienced ladies...and all were able to get a good portion of their blocks together in the class... They are fun...and can become addictive!!