Do an advanced search in the Hones forum with lapping as the key word. Just searching the thread titles yielded 20 threads on that particular topic. I'll give you some 411 anyways...
-Lapping a stone is the process of making sure it's perfectly flat.
-The brainless process is getting the Norton Lapping Plate and just following the instructions
-You can also get a 12x12" glass/marble/granite tile (but not ceramic), get it wet, slap on a sheet of wet 1000 grit wet/dry sandpaper, pencil draw a 3x5 grid on the surface of the hone after soaking it for 15min and move it in a figure-8 pattern until the grid disappears. Repeat the process until it disappears in a few strokes, turn the stone over and do the same.
-The first time around you should also round off the edges of the hone.
-I lap my Norton after every 2-3 razors, which is not much of a hassle for me as I also use the 1000 grit sandpaper as an initial honing shortcut.