I was in another thread recently where someone was asking for quilting advice and a couple of things were mentioned...the wavy stitch and quilting with decorative stitches. I'm assuming both are done with a walking foot right? How do you keep the line of stitches straight when doing these? I think I would end up going all over the place. Thanks for any advice, I'm ready to try new things other than SITD and the general meander and both of these sound like fun (but I don't want to ruin my quilt and I certainly don't want to rip out quilting).