The screen is actually really simple to open;
You peel off the bezel by inserting a credit card behind where it says MacBook and work in a clockwork direction being careful around the iSight. There are then 14 screws holding the screen in place, for which you need a small Philips screwdriver (between size 3 and 4 small). Make sure that the Sleep Magnet does not get lost when you lift the screen downward (as if you were closing it, only sans the case. You can then cut around and peel off the vinyl covering with a craft knife, and tape down some coloured acetate.
Putting the screen back together is a little fiddly, and it is easiest if you balance the MacBook so that the top case is flat against the work surface. Lay the screen back into the case, making sure to reinsert the Sleep Magnet into its grove, and then screw her back up.
On the reverse of the bezel are some small grey clips. These need to be
carefully prized off and then inserted into their grooves. Then, place the bezel over the front of the screen, and start to clip it back in
starting with the large clips at the base. Voila, job done.
My BlackBook sports a very tasty green Apple logo now
😎 See it here
THIS WILL VOID YOUR WARRANTY