Is it on with double sided sticky tape?
I've heard of taking a real small fishing line and slide it in between the trim and the bike to cut through the tape.
Then take the tape off the bike with remover.
To be a little more specific, once you've removed the trim as suggested, something like GooGone works really well to remove any remaining adhesive. It's usually not a difficult task, and once completed, you'll never know the trim had been there - unless it's a dark-colored bike and there's been some fading of the color!
Depends what you want to remove some are easy some are real pain take for instance the kuryi shark gills I removed man that was hard in the end i got them off but the silicon residue is still there :thumbup: