Sewing mitered corners accurately takes some practice, but it’s definitely doable for most home sewers. The key things are cutting your fabric strips with exact 45 degree angles, and pinning or gluing the seams really well before sewing so the points don’t slip out of place. Go slow, backstitch at the points, and check from the front as you sew to make sure the angles line up evenly. With a few tries, it gets easier!n