anyone good at installing them? My brain doesn't do angles well. I am using 2x2 tiles, and im working in a hallway that doesn't have any straight lines. I can't figure out how to do it. Each side is 80" in length, and it is 37" wide at the ends. basically an angled rectangle. I can't visualize how to do the tiles. no matter where I start, I end up with a bunch of weird shapes, not full tiles like I want. In fact, I can't even figure out what the shapes would be. I have the outside edge pieces installed all the way around, thats as far as I can get. Help.