Peter -
I'm not saying it can't be done - we did it without a special "certified" ZF guy. Wade's quote was "I've rebuilt VW Transaxles before - how hard can this be?"
I am saying my friend has a lot of experience, and really knows what he is doing around cars.
I am also saying that (in my opinion) - every shim, washer, and part location needs to be organized, and reassembled exactly as it comes out. And those shims start to fall out of the case as soon as you take the two long bolts that hold the bottom cover on.
There may likely be people near you that can help.
Good Luck with it - I am sure if you search, you can find a lot of resources.
You also want to have all the parts on hand first (and get some of the aluminum wave washers as spares) - I had a bunch of them that cracked or were broken.
Rocky
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