I modified an old pair of Vice Grips to do this job. The trim pops off very easily (after you have drilled out the rivet at each end) I ground the top of the jaw to that it hooks the edge of the trim and the bottom of the jaw so it sits on the bottom edge. I then work my way along the trim removing a small amount at a time to ensure I dont bend it. To get the trim back on you make sure the rivet hole is aligned and then bang it on with your hand, it's very easy.
Johnny