It is not a hard job to do just tedious because you must take your time and double/triple check everything during assembly. There are several DIY post on this site to help you. You will need to buy a couple of special tools but the money you save is well worth it. At a dealership your looking at hundreds of dollars for parts and 100.00 to 125.00 per/hr labor. Most will say it's a 13 to 20 hour just for the head gasket job. To give you an idea I bought the head gasket set, new head bolts, washers and some other non-related things I was working on for 180.00 dollars.

MB and MBUSA is not recognizing the wiring harness as a default so there is no recall yet. I am currently asking them to take another look at it because it is a fire hazzard therefore making it a safety issue. The wiring harness is a very expensive item running from 550.00 to 1100.00 depending what car you have. You can also find post here by searching for "Engine Wiring Harness". After doing some research report this to MBUSA and the Department of Transportation's Safety deparment and make sure they get it on file.