Hi, Anthony,
The first thing I do is use a pair of light leather gloves that I have cut the fingers off of. I start off by running a groove for the stiches that is deeper than the diameter of the thread. This gets the thread below the surface of the leather and protects it from abrasions. After the groove, I use an overstich wheel as a spacer for the hole marks. If you use waxed linen thread, it will stay tight when you pull it and "set" the stich, but it will pick up any color from anything it comes in contact with. Sometimes I want a bright white stich, and use nylon for that. Nylon resists "setting", so I pull hard enough on the thread to tighten about 6 stiches back to lock them in. The final step is to run the overstich wheel over the length.
dennie