Take lots and lots of pictures in detail. Take more as you go along. That way, you will know how it all goes back together. Do it when you know you aren't going to be camping for a while. These things always take longer than you think. Other than that, just start taking things off the walls and floor and have at it.
Do you have a general idea of what is leaking? Another question, are you plumbing inclined to the point that you have the skill to plumb the system with no leaks? If not, I would considering checking with a local plumber before you start rippin out your pipes.
Have fun with your project!!!
1964 Ace TT
1993 Gladiator TV