I am often asked if one can mow a lawn with a scythe. Sure you can!
A scene from Scythe Fest 2013.
Yes. Besides keeping your blade really sharp, when mowing dense bluegrass, you have to make sure that the blade gets down underneath the grass blades, otherwise the scythe blade can slide up over the grass, like it's on top of carpeting, and not cut much. To keep the blade low, you can actually press down on the lower grip, which will keep the blade pressed firmly to the ground. You may be cutting the grass pretty short the first couple of times, but the regrowth will be more tender, and easier to mow. You will have to mow less often with a scythe, than with a lawnmower.
Also, grass is always much easier to mow very early in the morning. Don't worry, your neighbors won't complain, even if you're out mowing at 6AM on a Sunday morning. Mow when the dew is still on the grass, and before photosynthesis gets going. It will be much less work that way.