Like others have noted, screws are covered in adhesive and difficult to remove. Take extreme care to not strip the heads. I'd suggest using a very small flathead to scrape some of the adhesive off before attempting to remove the screws.

Be sure to use the smaller iPod opening tool and press it in FIRMLY in order to get enough leverage to get under the bezel and pry it off. Adhesive is very strong, so don't be afraid to use a little bit of force.