I've done 3 vehicles with good success. The trick is to trim the film on the outside of the glass. Roll the window down and run the utility knife along the curved edge of the glass for pro-looking results. Or just buy the precut film from eBay - they sell it for just about any car. At that point it's practically peel n stick.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280