Quoted from flashinstinct:

Rule#1 Don't be cocky and tell yourself....yeah I'll remember this goes there.
Rule#2 Get the manual
Rule#3 Pay Attention
Rule#4 Take your time.

Quoted from Robotoes:

I disassemble in sections of the PF, and into ziplock bags. Every ziplock gets an inventory - quantity and part type (screw, washer, coil, etc). Photos, lots of photos.
Then I dump as much into the tumbler as space will allow. When all shiny, open up the ziplocks, make the inventory match the bag - re-assemble from the bag(s). Reference photos as needed.

Quoted from jrivelli:

Throw everything in a box next to you. When ready to reassemble shake the box well, dump out parts on the floor, assemble. It will make you a pro!

Quoted from 85vett:

good timing for this thread as I just started taking my BOP apart to restore it.
I started with the backbox and at this point I took my label maker and made labels for every connector and zip tied them on. For all the parts I'm using zip-lock bags and took about 50 pics of the backbox alone so far. I'm sure I'll botch something anyways though.
This reminds me, I need a tumbler
Hopefully this helps the OP and is not a thread hijack. Is this good enough for cleaning small pinball parts? - http://www.harborfreight.com/5-lb-metal-vibrator-tumbler-67617.html

Quoted from 85vett:

Yeah, I saw a lot of negative comments in the past about restores that had writing on connectors. Took me a couple of hours to do all the connectors on the backpanel (boards and light panel) but once finished I can just cut them off.