Thank about it like this. 200-500 grit stone = reset a bevel or establishing a new edge. 1000-2000 grit stone = sharpening and refineing the edge the main part of the sharpening. And 3000-8000 for polishing,honing and really trueing the edge. Techniqually it is best to have a 3 stone setup but you can get away with 2 stone as long as you dont let your edges get to blunt. I like to completely refresh my edges on my knives around every 5 times I sharpen. I just feel after awhile they need a good amount of fresh steel.