In your situation, it might be best to find a local quilt shop where you can go to sew and let someone else watch the grandkids for a while. Don't stress about getting the fabrics in the perfect place - there is no such thing as the perfect place. Put them in an arrangement that's pleasing to you, and don't stress over it. YBR is a very forgiving pattern, and if you've forgotten something chances are it won't matter, or you'll remember it later.