Yes you iron them on , then sew them one direction , cut open with a rotary knife , iron seams open, sew the other direction , cut open with your rotary knife .iron seams open .I have made this before & they are HARD to hand stitch , but do nicely on a sewing machine . They make foundation with the squares already printed on them so your rows are nice & straight. I made long pieces of these & joined for a queen size quilt top ,I did NOT use batting as I wanted a summer quilt & the fusing fabric gives it just enough extra weight for me .