AlWAYS do a final pressing before sandwiching quilt. I press mine on double thick towels with hot iron and steam with top side up. Do not "iron" but rather pick up iron and press then move iron and then press. This allows you to get top's block and seams really flat so top will be smoth and easier to quilt. Don't worry to much if seams are twisted since this will not show up when top is quilted. I have not found an easy way to do this! Also I always press seams as I go and still do final pressing.