You should lap the norton, if it's not flat then you're just grinding away for naught. The 600 grit wet/dry is what I used. Mark the surface in a grid pattern with a pencil, soak the stone and paper, then lap in an X pattern until all the marks are gone, then lap a few more times for good measure.

You can use a little pressure when honing, just enough to keep the blade flat on the stone. Watch the ripple in front of the blade to let you know that it's in contact along the entire edge.

Let the slurry accumulate until you're done. But keep the stone wet - a small spray bottle is good for this.