You are gonna get a lot of advice, but I like the "Ski Visions Ski Sharp Edge Tuning Tool". It's hard to wreck your edges with this tool. I rarely use the file. The NS boards have no bevel, so I set both settings at 0 degrees, and the stones do a great job of cleaning up and sharpening both edges. I keep the camber zones sharp, but it's personal preference on detuning the contact areas. I don't sharpen the tip/tail contact areas, just polish any burrs off. My only complaint with the stones is that they require frequent cleaning because they are small.