I took lots of pictures as I dissassembled, I did all the prep/repair work on the parts I planned to reuse. Made a list of parts to order and list of to-do's. You are passed half way when you put more on than you take off. The reassambly is the reverse of the dissasimble. You have the pictures and notes as a guide. Keep all documents on parts and all receipts. Identify and lable all the parts you get, seals, gaskets, molding, etc. Do not throw any thing away, helps in parts identification later.
This will help keep you focused and organized.