I have made 3 of these. One just got washed today should mail it tomorrow. I followed their advise on the binding because I had never done it that way. 1. I learned (from experience) in order to not quilt the backing into the quilt while quilting to fold it over part way and then saftey pinned it down. 2. quilt as desired but leave about 3/8-1/2 inch from the edge with out stitches. 3. I then trim up the batting because I left it just a little bit too big (old habits). 4. then I unpinned and cut the binding. 5. I did not like their idea because it is not a double fold and therefore is not as strong so I cut it so that I could tuck a little bit under the batting and then turned the folded edge over to the front and "pinned" it down with hair clips and machine sewed it down with what ever stitch I like best for that quilt.
I hope this all makes more sense than their directions. Good luck.