Doc, I use a #11 exacto knife to do most of my work, needles and other blades for thicker hevier lines and shading, when using the #11, break off the first third of the blade, way too flexible, sand or scrape your surface smooth, very smooth, remember your going to ink this and when you do it will fill any scratch in the surface, cut in your design, ink it, we use india ink, wipe off the excess, when alls said and done, we use some #0000 steel wool to clean up and knock down ridges, then a good coat of paste wax ie old johnsons in the yellow can, buff and voila!