In tearing down pins, it's usually done in chunks. I take many pictures of that specific area I'm working on. All those parts go into a labeled bag, ex UPPER LEFT RAMP.

Then, I usually diagram on a notebook that section, and label it the same , ex UPPER LEFT ramp. I like to rough-out a diagram, noting specific things, like missing screws on parts, etc. That way, when reassembling, you're not looking for a missing screw! I also like to number pics on my diagrams that correspond to the pics Ive taken. Ex: UPPER LEFT RAMP 3-15. 3-15 means those specific pics go with that specific area.

Just take a TON of pics. Lots of angles. Also, I like to point to things in my pics of note. That way when going back days later, I can recall why I was taking THAT specific pic.