Open the trunk then remove the carpeting so you can see the back of the tail lights. If you can't access the bulbs there you have to remove the four to five nuts to take out the whole assembly.
That is one of the easier things to do on these cars, Just pop the trunk and remove the lining behind the tail lights, 3 phillips head screws and your good to go!
the actual plastic cover over the light can easily be unbolted off the frame, once you take it off, you merely pull out one light bulb and put the new one in.
You need to open up your truck and pull back the carpeting/lining around the interior tail light. There will be four phillips head screws you will need to loosen in order to pull the taillight out.