Take Stubborn 1’s advice, real easy to forget where things go! If you have a digital camera, also take lots of photos as you take things apart. Make note of which spring and which end of the spring goes where. Don’t just start pulling parts off.
Doing rear brakes is not complicated but it can get frustrating if you don't have the right tools for say removing/replacing the springs.
Suggest at the least you find some kind of manual, even generic, that covers doing this job. Try the library as they usually have manuals.
Download the section on brakes for the Camry at the link below. This will give you an idea of what the job involves.
http://oregonstate.edu/~tongt/camry