Take lots of photo and notes before you disassemble anything. Note the colors of fasteners, are there washers? What kind? Sealer? Undercoating? This will be your best aid in getting everything back together correctly. Your memory will fail you. Which way are the cotter pins facing? What are the markings on the bolt heads? Minor details like this might not be important to you but may be useful to the next owner.
i hear yah ...but im in the " camp " of screw it ... not gonna bother with rusty bolts etc.... buy new ones less hassle and nicer end products ... screws / bolts not that expensive