I’ve never been particularly adept at sharpening my edge tools (chisels, plane irons, etc.). It’s not that I couldn’t get them sharp enough to work, it’s just that I’ve always experienced inconsistent results. One time, I’d get a blade so sharp, it simply glided through hard oak and maple. The next time I sharpened that blade, I’d be lucky if it didn’t tear its way through soft pine. Freehand sharpening always seemed like something that would take decades to get right (an opinion no doubt influenced by the fact that the best tool sharpener I know has made nearly 95 trips around the sun). The trick seems to be locking your wrists and fingers as you pass the tool over the stone, to keep the honing bevel at the same angle during every pass. Fail this, and you end up with a rounded bevel face and an edge that’s none too sharp. Yes, hollow grinding helps, as the tip and heel of the bevel are easier to keep flat on the stone. But unless the tool has a wide bevel, like a big chisel or heavy plane iron, even hollow grinding is no guarantee.