Have a search on the net to see if anyone has done a proper guide with pictures.
1) turn the sucker over and lay it on something soft (tea-towels are a good choice).
2) Using the correct size phillps screw-driver undo the 3 screws at the front (1 may be under a warrenty sticker, remove the sticker).
3) Remove the two screws on either side towards the back.
4) That's it!
5) Flip it back over and slowly lift the top of the case off (be careful as the LED section in the top of the case is attached so either disconnect or unscrew the 2 little screws that hold it to the top case).
6) Lift up the little white bit of plastic the holds the keyboard ribbon and then gently pull the ribbon free, this will allow you to remove the keyboard.
Have fun
:-)