I just watched the tutorial. She says to match up the seams - I don't think you can nest them because both pieces are pressed in the same direction so you have to line them up but can't nest them. We are usually pressing things being sewn together in opposite directions so we can nest them but with this tutorial she's using white fabric and presses the seam away from the white fabric. Hope that makes sense. I can't wait to try this block - need to finish some other ufo's first though.