I don't know if I get them "scary sharp", but sharp enough to do anything I need. When I'm working on a gun, sharpening is a constant thing, so I just hit chisels and gouges now and then, but seldom sit down and give them a razor's edge.
I mostly use a very fine stone that is made by Fiskar's, you'll find it where they sell Fiskar scissors. I don't mess with water or oil, just clean up the stone when it looks cruddy. I hold it in my hand and make a diagonal forward/rocking stroke on the edge of the gouge, all in one motion. The gouge is moving forward, cutting into the stone, and at the same time twisting from one side to the other. A forward/rolling motion that ends up being a diagonal stroke across the stone. Then I look to see if the angle was good by visually checking the edge. Then I LIGHTLY hit the inside curve with a narrow ceramic rod, rolling it in my fingers and moving it forward and from side to side, again, all in one motion. Short strokes, the rod probably doesn't travel more than an inch. Bill