Honchey, make a small sample up and meander it to practice before doing it on a quilt. Free motion to me is a lot easier than stitching in the ditch. I always get frustrated when I won't stitch exactly in the ditch and it takes me longer to quilt in the end. I'd give it a go with a small piece like a table runner or something like that and break out of the stitch in the ditch.
Quiltjoey, without seeing the jelly roll quilt you are talking about, I'd probably also do some swirly designs for quilting to soften all the straight lines
