Like all things quilty, it is an individual preference. I set all my seams and I press them open 99.99% of the time. I also starch the daylights out of my fabric and I square up each segment and/or block as I go. For many, my way is futzy and too much, for others it is not enough. Try it and see if it is something that work for you or not. I enjoy just about every process in quilting, so I enjoy reading and trying new things to see if it is something I will enjoy or produce better results. Have fun!