I need both fronts and they are simple to do. Pull off old one, noting the orientation and where they were positioned, maybe even mark the sill with a permanent marker where the split is in the gasket. Simply replace along the metal body lip by hand. I would use some windex as well so you can move it around a bit for optimum seating.

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2010 Specialized Epic Carbon Comp XX
1976 FJ40 Toyota Landcruiser (SOA,350ci sbc V8 crawler)
2007 X5 4.8i
2008 Porsche Cayenne Turbo S