Late Saturday afternoon, we decided we could install the cement board in the shower stall. We unrolled a huge sheet of plastic vapor barrier, stapled it up to the wall, and then realized, to our dismay that the cement board would need much more support than just the existing studs. It needs to be screwed around the edges and into the studs every 8 inches. We had no support around the edges of the panels at all! Frustrated, we gave up for the night, retreating to the local video store and chinese take-out.