I figure that a first-timer could easily knock it out in an afternoon. I don't know the current pricing for a harness, although there is a fellow on the boards that re-builds them for significantly less than the price for a new one.

I'm on the fence about just doing it myself and keeping this car around as a (another!?) spare car, but I've got my 500E for fun, and my E300D for economy. A 400E / E420 is an incredibly nice cruiser, but do I really need it?

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Current rolling stock:
2001 E55 183,000+ Newest member of the fleet.
2002 E320 83,000 - The "cream-puff"!
1992 500E 217,000+
1995 E300D 412,000+
1998 E300D 155,000+
2001 E320 227,000+
2001 E320 Wagon, 177,000+

Prior MBZ’s:
1952 220 Cab A
1966 300SE
1971 280SE
1973 350SLC (euro)
1980 450SLC
1980 450SLC (#2)
1978 450SLC 5.0
1984 300D ~243,000 & fondly remembered
1993 500E - sorely missed.
1975 VW Scirocco w/ slightly de-tuned Super-Vee engine - Sold after 30+ years.