I usually use steam, but you have to have a light hand or your can cause more problems that you solve with pressing. I don't disagree with those who don't use steam. In my classes, I'd say 80% of quilters didn't have a light enough hand to use steam. Many of these quilters were beginners. Steam is a problem to use with some pieces because it's almost impossible not to mess up the grain. My suggestion is to try it on something that isn't going to kill you if you mess it up. Then decide from there steam or no steam. I don't use steam on very small pieces due to risk of burns.