Don't worry about lining up the blades, because they won't stay that way. Blades should be balanced, but don't go overboard since close is good enough. and also don't go overboard with the sharpening and needing a knife edge because it will wear off quickly and just results in more metal being removed than necessary. Oregon recommends that blades be sharpened at a 30 degree angle and leave a .030 blunt edge.