You will have to pry them off after you take the screws off...just pry them from the corners. When you get the tails off (the black goo will stay on them), you can put them on foil...goo side down, and put them in a 200* oven for a few minutes (monitor them). When they get hot enough, pry the lens off carefully with a small screwdriver. Be careful not to crack the lens. When you put them back together, heat them back up, and use silicone to seal them properly.
i remember when i dropped one of those LED taillight bulbs and had to take the whole friggin taillight out just to get it out. still need to reseal it since it leaks in the trunk and water gets inside the taillights.