It isn't "hard" but it's tedious. I did one on my driver car so I would do a better job on my "good" car. I made a few mistakes...but not serious. Most, but not all, of what you need to know is in the ship manual or on these forums.

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86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm