You're in for a heckuva time with this one. Byrdandcompany and I just did this about three weeks ago on his 1980 300SD. I am a maintenance technician and I work on VERY expensive metalworking machinery for a living (I could buy several McLaren SLR's for the price of the Mazak Machining Centers we have), and I am telling you it ain't easy if you can't turn the cylinder to the dismount notch or notches (depending on year model) and it took me a few hours to do it carefully. A good shop will probably want $500 to do it, beware of anyone who offers to do it for cheap because they probably have ABSOLUTELY NO IDEA what they are doing. You can pull the instrument panel out and "hotwire" the starter, but you cannot turn the steering wheel. The steering lock that is integrated into the ignition assembly is a work of art by itself - it probably cost as much to manufacture as some small cars of its day.