Re: rear deck lid (SLACKER 1.8T)
I just did this to mine.
One thing you should know is that those plastic clips on top of the rear deck cover the bolts holding it down.
Also bolted down under the plastic clips are metal "horseshoe" shaped things. If you try to just pry up on the platic clip, you are actually prying on the metal piece (that you can't see under the plastic clip) and you won't get anywhere.
Grab a stubby flathead screw driver and start at the corner, lifting gently up. Once you get it up a little bit, then go to the other side and lift that side. It will come out without much force.
Just don't stick the screwdriver too far under there or you will be prying on the metal part which I guarantee won't move. Just pry up on the very edge--just the plastic.
It is hard to describe in words, but once you get the first one it's obvious.