I do a few of these every week. Here's what I do. I lay a piece of rubberized shelf liner in the sink. Put the DMT on the shelf liner. Adjust a flow of water over the DMT to wash away the swarf as it develops. Rub the Norton lengthwise on the DMT using slight side to side ovals. Flip the Norton end to end once in a while. After the first 20 strokes take a look at the Norton. Usuallly you'll see a light oval in the center of the stone. Most times Nortons are crowned in the center. Keep stroking. When the light area marches out to the corners, you're done. Nortons do not come plane from the factory and must be lapped or you risk putting a frown in your razor. The thin edge of the steel will conform to the shape of the stone. Oh, also remember to put a little chamfer on the all of the edges to help resist pressure flaking. You're done!