You don't need to worry about the block end of the oil line. I did this job recently (rebuilt the turbo myself with a kit from turbocity). A set of obstruction wrenches would be a huge help for this job, but not absolutely necessary. I started a writeup on this, but I am sure it is not the best. Hope this helps:

http://groups.msn.com/thediygang/mercedesbenz.msnw?action=get_message&mview=0&ID_Message=90&LastModified=4675447063882614615

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'01 CLK430 (hers)
'99 528iT (turd)
'87 Porsche 928 (just for fun)