I just sighhh...and do my labor-intensive method. I cut small squares of waste fabric, lay out my blocks like I want them on my bed. Then start labeling the squares and pinning them on the upper left-hand corner of each block about a half inch in so I can leave them on and not stitch them into the seam allowance. I usually number the rows using letters for the columns. Like 1-A, 1-B. 1-C etc. then 2-A, 2-B. 2-C ect. Each block gets a tag. It takes time up front but really saves times during the stitching and if I happen to drop the pile of unstitched blocks on the floor, I can just pick them up and find where they go without having to do the whole layout again. Sometimes a slip will fall off and sometimes I stick myself with a pin. I will remove the tags after I got a row stitched together but will usually the tag on the first and last block of the row until the rows are stitched together to. This is what seems to work best for me. I don't have room for doing a layout in my sewing area, so a design wall is out of the picture for me.