lol, its extremely easy dude, to get off the little black clip/screw type thingies you just twist them, use a screw driver if you want or just do it by hand. The clips are sort of a 2 part thing, you twist the section with the hole for a screw driver and it will slowly pop outwards, dont apply too much pressure as you do it or youll just push it back in, being gentle is the trick.
Once it has popped out a small way you can simply pull it out of the hole, its pretty straight forward once you get to playing with them.
As for getting at the tail light bulbs, once the trim is off, there are about 4-5 bolts on the inside of the boot that hold the tail light housing in place, loosen all of them and then start removing them one by one making sure you keep a little pressure with your leg or have someone hold the tail light housing incase it falls off (because the bolts are undone) once all of the bolts are out just pull out the tail light housing, it should just slide right out.
Now youll need to balance it on your leg or have a similar height chair handy to rest it on as you will have some short wires connected to the tail light. Replacing the globe is a simple matter of twisting out the cap in the centre of which ever light is blown and swapping out the bulb.
Follow the steps in reverse to get it all back together and presto, a replaced tail light
its a 10-15min job at most, but once you get it all out youll realise how easy it actually was