I did exactly what you are talking about when I made watercolor wall hangings. It's an awesome way to handle small squares. Lay some out onto the gridded fusible, fuse with an iron, and repeat until the entire quilt top is fused. Fold and sew each seam in one direction (horizontally or vertically). The top gets really funny looking when it's been shrunk all in one dimension! Then you need to clip with scissors on the backside at each intersection so you will be able to fold and sew again in the other direction. That's all there is to it. It's really a great way to go!