It's remarkably easy! Trying out the quilting foot on my new-to-me Bernina. The unmarked spiral was only a bit hard to see, so drew feathers and a star; only glitch was that I didn't lower the feed dogs and so took larger stitches on one leg of the star.
I'd been avoiding it, hearing everyone talk about how hard it is, and especially as I am no good at embroidery, but it's really not hard at all!
Now just to baste the windy days quilt and get started!