Pete, I’ve used Ura-Dashi on everything from 1/4” chisels to 70mm plane blades (I don’t own anything wider). I’ve tapped out about 45 blades and maintain them routinely.
Jim, certainly not everything need be plainly simple to the unindoctrinated, but that is why forums and classes exist. Surely you did not pick up a guitar and start playing, you needed to learn a thing or two first.