I would recommend the following:

1) PHOTO - take 'em before something comes off, multiple angles and once you removed the part
2) LABEL - I took to printing those handy little print ribbon labels, tagged each item
3) SPREADSHEET - record all the labels you produced in a spreadsheet, I organized mine along the lines of the Factory Parts Book, and wherever possible I actually included a column that would show the page & diagram in the book
4) GROUPS - I grouped the parts together per their functional use, so suspension split into FRONT & REAR, steering separate, engine bay electrical, wiring, etc, etc...

All of the above was done when I did my '80 Diplomat Coupe, given that life gets in the way of this great hobby of ours, had I not done this, I would have forgotten and/or struggled to find on-line info or decipher the specifics of what I see in the FSM.

Oh, start to finish it took me some 15 yrs to get the Coupe done...ha ha, but that was in between getting married, two houses, two kids...you know, life!