Birthing is not my favourite method for doing a quilt. I was never satisfied with how the edges and quilting turned out but I can tell you how I did mine. I placed the backing on top of the batt, right side up. I placed the top on the backing, right side down. I stitched around the edge leaving about a 10 inch open for turning on a baby size quilt. I have never done anything bigger than a baby quilt with this method.
Now comes the fun part, turn the quilt right side out through the opening and try to get it all smooth and the edge even. I pinned all around the edge after making sure the seam was right at the edge. I smoothed the center and pinned well. I stitched about 1/2 inch all around the edge to secure it (opening hand sewn shut first). I machine quilted the center with some scattered motifs to hide the fact that I couldn't get the sandwich perfectly matched.