Someone showed me this way, I'm sure there's lots of different ways. Lay one piece down & then overlap the next piece a little. Take your rotary cutter & slice a wavy line from edge to edge through the double layer. Peel away the little scraps and the two pieces butt perfectly up against each other. Keeping it flat, use a large stitch and take a stitch on one, and then over to the other & back until the whole seam is stitched. Place in quilt as normal. I've used this method for alot of baby quilts & donation quilts & found it works good for me. HTH