insert a thin flat blade screwdriver at the point where it bends over and under the sill to the outside (if that makes sense) and pry it up. Use fingers for the rest.
Its putting it back that is tough (you need to bang it into place) without cracking the plastic

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1982 300SD (214 k, excellent shape) kidmobile running mostly biodiesel, gets 31 mpg hwy with 2.82 rear from a euro 500SEL



1976 115 body 240D 4-speed (traded for Jeep parts) - Engine lives on in my CJ7