That's the guide. It should have a directional on it for how to load the file. Then as far as sharpening goes, you go the direction that the file is supposed to. Not nose to tail or vice a versa. Unless you switch the file around you are going to go opposite directions on each edge of your board. Unless I am missing something it shouldn't really matter. Your goal is to get the edge sharp, which direction you go shouldn't matter. Especially if you are using a polish stone. Just don't take too much off, it only takes a few passes with that guide. It shaves the metal off like crazy.