I purchased my HQ LA used and had to disassemble it and then put it back together. My DH helped me take things apart and I took tons of pictures and wrote down lots of notes. Like everyone else, I put screws, washers, nuts in baggies and labeled those, too.
Then when we unloaded it we couldn't put it back together at that point. It was a drop off and go back to our summer house situation. So, it was 2 months later when I put it back together. My DSIL the carpenter helped me with that. So glad I took all those pictures and wrote down all the notes. We got it back together without much difficulty.