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An easy way to see if the stone is flat, is, place a ruler or something else flat on the stone, and, if light or water passes between the stone and the ruler, the stone needs lapping.
Yes, make...

There is not a big difference if you use the sandpaper with the stones soaked wet or dry. I usually prefer the stones to be dry, because there are some naturals that can't get flat when wet. And it...

Your father has a nice progression of stones, although I don't know this samurai brand, they re pretty much exactly what you need.
For lapping, some sandpaper onn a flat surface will do the trick,...