Another thing you can do to make sure that your fabric piece will cover the area it's supposed to -- pin it along the seam line and fold it over as if you'd just sewn it. Hold it up to the light and make sure that you have sufficient seam allowance on all sides. If you've used templates to cut your pieces, you should. Sometimes you'll see that you need to adjust it a bit.
ETA: don't be too obsessed with that 1/4 inch seam allowance. If it's a bit too small or a bit too big, who cares? The Quilt Police are not going to break down your door and inspect it.
Last edited by IceLeopard; 07-14-2020 at 06:15 AM.