I'm always surprised when I hear of people who embark upon lengthy and expensive bathroom remodeling projects but don't bother to record progress in any way. It only takes a few minutes to photograph all aspects of your bathroom especially if you have a digital camera, and the results will serve you well as both a tool in the redesign and as a talking point and reminder for the future.
What you must remember when you're about to begin your bathroom remodel is that your bathroom is never again going to look like it does now. Once all the fixtures have been ripped out, all the ceramic tiles hacked off the wall and the floor covering is lifted, it's never going to look the same again. In fact you won't even.
Try to look forward a few weeks to the point in time when your bathroom remodel is complete and you are admiring it for the first time. You are going to wish that you had taken a few pictures of the bathroom before it was remodeled because you're already having trouble remembering what it used to look like.