We got a really good deal on our tile. It was from a gentleman that was liquidating all his old stock. We got it for $1 a square foot. Anyway, while searching for tile and asking some of the professionals how it was done; I found only one website that explained it correctly tileshop.com. They have several good videos and since this one was accurate, I think we will use their directions on Do-It-Yourself Showerpan Installation. The information we based our bathroom floor on was from their Kitchen Installation video.
One the biggest differences is very few put backer board (cement board) down, let alone put a layer of thinset down first and then the backer board. You do not want your floor to move or shift under your tiles; otherwise THEY will shift and move causing cracks or the tile to pop up. We have yet to grout but here are a few pictures of Ian laying ours.