i took mine off with a razor blade...
one side was very easy, i just peeled it up, and the rest came off, just like tape. it did break a few times though, but i could keep on going.... that side only took 10 mins.
the other side, the pass. side was a pain. this is were i wish i had the goof off... that side i was consatnly on there with the razor blade. trying not to scratch the clearcoat to bad, which i didnt. But that side took me atleast 45-50 mins... and then add the time for waxing and buffing the car, to get the scratches out from the razor blade....
hope that helps! good luck