Hand stitching isn't difficult, once you master the basics, and is superior to machine stitching - the downside is the time it takes. The trickiest part is getting the stitch line neat and straight. As for your machine, it's what Chuck said, 0.8mm is big even for an industrial machine so there's no way a domestic machine could handle it.
When I first started making holsters I used my domestic machine without thread to punch the holes (single layer only), this gave me even straight lines and then when I glued the layers together I used the awl to enlarge the holes and hand stitch.