Scary to look at pulling all the connectors. TZ was the first one I had to pull the head cause my basement door is not wide enough. I labeled everything.
Total waste of time.
Take a picture, but really the harness kind of self wires. You could sharpie the connector numbers, but the connectors are keyed and when the harness is right it just works. Later I got a Pinbot that was totally apart. No one thought it would ever go back together. Same thing, put harness in and everything fell in place. Incidentally, I made someone really really happy with a good price on a pinbot in OK shape, probably still in the guys collection 20 years later.
Look at it, take some pictures and take your time.
The TZ is a HEAVY game. Best to do it in parts. At least pull the play field if you are going up the stairs.