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It's really not a bad job. The worst part IMO, is fiddling with the oil feed and return lines when reinstalling the turbo. Oh, if you run into problems with exhaust studs, that would be a real PITA, too.
You probably don't need new oil lines, but you will need new gaskets and crush washers for them. Just clean them out when you take them off the car. If you ever have to replace your turbo, then it is a good idea to use a new oil feed pipe.
Yeah, you should take the head to be checked out. Like you say, it's not worth doing the job without having the head looked at. (Actually, when I did my HG, I did just slap the head back on, because I didn't really know it was that critical. It has been ok so far, but I think I have been lucky. It's been going maybe 10k miles since then.)
Yeah, you got the order right, first take off the downpipe from the turbo. Then I think I unbolted the oil return and feed lines, and then removed the exhaust manifold from the head. I left the turbo+manifold in the engine bay. The intake side is pretty easy, just make sure you label everything so it goes back the right way.
When reassembling, don't forget to hook up the thermal time switch! It makes starting a little difficult if you do. DAMHIK :)
Probably you will also want to use a new thermostat, and flush out the cooling system afterwards with some kind of flush. I think when my headgasket went, it contributed to the radiator clogging up, which I ended up replacing.
I think it took me about a day to get the head out, and a day to put it back.
Good luck!
Greg
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