Not sure if you have your mind set on using the rocking motion, but here's a link to Jean Brown's website:
www.jeansimpressions.com Scroll to the bottom of her page for a video of her technique. If you prefer the rocking technique, then look into purchasing Roxanne McElroy's book: That Perfect Stitch. I've read many reviews and everyone speaks very highly of her book. Hope I was able to help!