Ok, so I want to get started (finally) on something that tells me to cut the length of the fabric. First, this means cutting perpendicular to the selvedge, right? How am I supposed to do that and be certain I am not going to have waves all over the place??? Yikes-- I have a hard enough time cutting the way every resource I've looked at in the past 3 months says to cut! Should I starch the fabric? Will that help??? Any advice would be appreciated!