There's a million different ways to do it and everybody has their favorite method that works best for them. None are right or wrong- it's getting them done and shipped out that's important. ;-) I do it slightly differently. I prefer a cotton batting- Warm & White or Warm & Natural. You can lay the backing and top- right sides together- on top of the batting, smooth out the wrinkles with your hands and it won't need any pinning at all- altho I have been putting a couple pins down each side and in each corner since I cut and layered ten quilts and then folded them up sew all at once- I needed the pins to stabilize them thru the folding and handling. When I sew around the four sides with 1/2 in. seam allowance, I only leave about an 8 in. opening on one long side to turn the quilt. Turn the quilt right side out, lay flat and smooth out the wrinkles again. (You can even iron it smooth when using cotton batting.) Since I use a 1/2 in. seam around the outside edges, I can fold under the 1/2 in. at the opening and stitch around the entire quilt at 1/4 in. which stabilizes the edges and closes the opening all at once. I prefer to quilt in lengthwise parallel lines- diagonal quilting is on the bias and I sometimes get shifting layers with the "stretch factor"- YMMV. Warm & White can be quilted up to 10 inches apart, so I'm sewing a line the width of my machine's harp- about 6 inches, down the two long sides, then folding the quilt over at the stitching line and using the edge of the quilt for a guide for the next two inner stitching lines at about 7 in. since I'm a bit over from the edge of the quilt. The final stitching line I eyeball down the center of the two stitching lines on either side or you can lay a 6X12 ruler along the stitching line to the left and just sew alongside the ruler at the approx. center. I can now cut, sew, turn and quilt a twin size (one fabric width wide- approx. 45X90 in.) in about 1.5 hrs. I want to do 30 quilts- if the batting holds out- and I'm trying to develope the quickest process and still have it sturdy and durable. I'm into speed at this point!
See what works best for you!
Hugs,
Leslie & The Furbabies in MO.