I know you think you need to mark your quilt, but consider trying to do improv/ freehand. It saves so much time, your success is from making it look nice, not in following the lines. And it's just more fun. If you can doodle, you can do freehand FMQ. I occasionally will mark a dot as a landmark x number of inches, to keep a pattern going evenly, but for the most part, my piecing is something of a grid to work off of, and then it's just play.