Hi
I did mine about three months ago. Olin made very good comments already. The job is not that difficult, but time consuming (22 hours). BTW, everyone will be impressed after you show them a pic with everything disassembled. The car is better left on the ground. I'd leave the front seat in. But removing the steering wheel helps. This is also what the manual recommends. I took pictures from the vacuum lines and how they are connected. I screwed the fasteners back to their place where possible or attached them with tape. Be careful when disassembling the heater box, there are some clips and plastic that can break.
Good luck, Bruno

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1992 300TE 160 kmiles