I just took some "tacky" gold lettering off of the back of my 91 convertible. They are stick-ons and after 16 years of being on there, it just took some "Goo Gone" and a plastic scraper (or fingernail if you prefer) to get them off. Just get under an edge and pull. they'll come off. They'll probably break the letters and they will come off in pieces etc. Once you get them off, just work on and saturate the glue or adhesive tape that is left on with GOO GONE or other any similar product to break down the adhesive. Make sure you DON'T use anything that will harm the paint; read the label.
The rear end of my 91 looks good as new. It took me about 1.5 hours total with interruptions from my wife.
Best of luck.......