I agree with Poncho and the heat gun idea.
Keep that heat gun moving and warming the the first couple of inches, and keep gently "testing" the bond with a plastic razor blade. You don't want to overheat or to concentrate that heat.
It's more about releasing the glue (2-sided emblem tape) than it is about cutting anything.
Once you get the emblems (letters) off, you can use some aerosol adhesive remover to clean up the residue.
It would be nice to have an opinion and advice from some of the autobody pros here on HR to confirm this.