After sharpening both sides of the blade place it on the kits cone-shaped balancer. If one side dips below the other continue sharpening it until the blade rests level. Return the sharpened blades to the mower and reattach. If you have a torque wrench its a good idea to use it here. Often you need to tighten the blade mounting bolt/bolts to a specific tightness level. Typically measured in pound-feet your instruction manual should list these specs. For example my personal machine the Honda HRR216VKA between 36 to 43 lb-ft of torque is required.
Several buyers suggest coming up with a mowing pattern that moves away from the outlet and thus makes it harder for you to trip over the cord. One buyer found that the motor would get dirty during use and recommended opening it up and cleaning it with compressed air. When you first lay eyes on the Sun Joe MJ401E Mow Joe 14-inch 12 Amp Electric Lawn Mower you may be struck by how small it is. At 29 pounds it weighs almost half as much as the next lightest mower on our list. This makes it easy to maneuver but it does raise questions of durability.
Your Best Digs also recommends the Sun Joe mower but the reviewer also added a number of caveats. He found it will get the job done if you prefer to only bag and just have $100 to spend. However the clippings compartment filled up quickly for him. And the height adjuster felt flimsy and required adjustments on each wheel.