Large glass company did mine at the house in an hour or so - original was terribly sand and rock etched. They did fine on glass, but screwed up the chrome trim cover a couple of times - they bent a portion initially and had to buy a piece at local MB dealership to replace it. Not the best job.

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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg