What I did, since I don't own a dremel (yet) is took a hacksaw, and starting at the back/pointy end, Started carefully cutting inside the "notch" between the lens and the back. After I'd gotten about a 2 - 2 1/2 inch cut, I took my widest straight slot screwdiver and tried to pry it open. If it didn't give, I cut a little more (about a 1/4 inch at a time) until it started to give. Once it started to give a bit, I could finish from there by hand.
It fit back together that way real well, because the hacksaw made a much smaller cut than I pictured a dremel doing, so once I had the colored lense out, just a bit of clear silicone had it back together like brand new. Check my page for the final results.
1998 SE Midnight Blue Pearl
Gutted airbox, FRAM AirHog, removed MAF Screen, eBay clear corners, extended brake lights
I'm so much cooler online