That's how I do it too Patrice, when I finish an area. It's a good way to hide those stops and starts! Although, I bring my bobbin thread up to the top when I begin and I do take a stitch or two in place at that time. When I'm done, I thread both those threads together and take them right back down in the same hole they came up in and bury the knot just as you described. Is that how you begin your stitching?