Did mine in 2010. Actually if you get some xylene and an old windex spray bottle you can get the adhesive to release easier by keeping it wet with xylene. I pulled mine off in big pieces and only used a scraper edge to lift just enough for me to grab another piece. REMEMBER, your clear coat is under the Diamond Shield and you don't want cut marks in it. Xylene will not harm the clearcoat. The spray bottle helps a lot to remove the adhesive. Just have a lot of patience and pull slowly so as not to pull the paint off especially near the edges where it seems the paint is its weakest.
Xylene will also make your hands very dry so if you can use a good pair of non pourous gloves that would help except that the Diamond Shield will stick to the gloves. I did it bare handed and eventually after months of using hand moisturizer they were OK. MH looks a lot nicer now without the Diamond Shield and the black mold.