Maybe a dumb question Ben, but what does the masking tape mark out for you that's taped on top of the tiles?
I just did that to make a note of the first set of tiles I had layed from the day before. That pic is after adding some additional ones. Before you all say "that's all?" I also finished doing the shower with 6x6 tiles and the landing. It always amazes me how long it takes to do things like this. I even had my brother in law around some of the time helping cutting tiles for me.
Also, I have some make shift knee pads that I use made out of bubble wrap. They actually work about as good as a nice pair of real knee pads. I'm just too fat and out of shape to do this stuff efficiently.