Use a fine line marker, number the tags as in 1-a, 1-b, for as many blocks and rows your quilt will have, attach a tag to each finished block, with a straight pin (figure it out) and stack your blocks, knowing you will be able to lay them out in the correct order when you are ready to sew them together. Think about it, there are purchased tags for this purpose, and the tags on the bread are free!!