I used to sharpen my own Mora blades, but I suggest you just buy new ones. The blades must be ground on the top bevel, exactly the same as the original grind, which changes angle along the blade. If you blue the edge when grinding, throw them out. Then they need to be lapped on a hard stone, and finally stropped to an edge. Unless you have some experience and talent at doing this the chances of success are small. If you take care of the factory sharpened blades they will last several seasons and are really not that costly when you look at it that way.