Some quilters actually finger press or use a tool (such as a wooden blunt stick with a point for turning corners) used in paper creasing to press as they piece. It's useful at the machine when piecing small pieces of fabric. Of course, long seams would certainly need more and particularly when setting a block together, applying sashing, etc. Saw this on F & P show. What works for you, so try variuos things. I usually press to the dark but good judgement sh prevail.