OK, so it is not the Great Wall of China or the Pyramids of Egypt. Just the Minor Wall of My Front Yard. I have managed to put in an hour or so of shifting stones after work each night. Turns out I was absolutely right in my suspicion that dry stack walls are harder to pull off then they look. The problem is that you tend to quickly use up all the conveniently rectangular stones, then are faced with all the funny shaped ones. And one little knobby bit on a rock can leave it wobbling precariously or stubbornly refusing to fit into the space you just know it should fill admirably.
Still, for my first attempt I am learning a lot. For instance, tomorrow I am running out at lunch to buy a chisel.