I use my sewing machine to do my stitching. Since I'm still new to sewing I always test on a scratch piece of paper first so I can make sure I have the settings I want for that particular card. I will sometimes build my card on one layer and stitch other papers to that one card then once I'm done I'll glue it to my actual base card, that way it will hide the underside of stitches. If I don't do that then I'll line the card so you wont see the underside of the stitches.
I'm not sure what else you mean by technique though, could you clarify that please or did I answer your question?
I've only done hand stitching so far, and mostly (or maybe only) on layouts. I'll trace a design onto the paper and then use a paper piercer to make holes, or just do it with the needle as I go along. I've also used the Bazzill In Stitchez (sp?) templates.
Gorgeous pages. I just don't really have the patience to hand pierce & then sew. Have you seen that new tool? It pierces & has different wheels that pierce your paper in different patterns. It looks a lot like a rotary cutter. Looked really neat & was wondering if anyone had used one. That might be something I'd use- sooo much faster. I just can't remember the name right now.
I use my super cool sewing machine on my LO's. I have needles that are too dull for fabric so I color the shank on them and use them for paper. Don't use fabric needles on paper because it dulls them REALLY fast. Oh, and sew slowly so you can control it. You might also want to lower the feed dogs so you can free form.