Most people mow their lawns without giving it much thought as to the mechanics of the action. They may pay attention to good habits like the 1/3 rule, and mistakes they probably shouldn't make. Many folks will put more thought into which lawn mower brand they buy than they would any other part of the process, which is perfectly okay and will work for many people. However, there is one wear item on a lawn mower that you will have to replace at some point, and that's the lawn mower blade.