Some of my neighbors rented a lawn aerator this weekend; they got a group of us together, and each of us is aerating in turn, making the little lawn turds (they look like goose turds, but without the geese). It took a couple of hours, but with so many of us in, each of us didn't have much to pay for the rental.
The aerator thing isn't too complicated, but boy is it heavy! I got a workout.
I couldn't pull the handle thing to raise the spikes and had to get a neighbor to help every time. Other than that, I'm now a minimally experienced aerator operator.
Learn something new every day!