A normal unopened Xbox console.

Turn you xbox upsidedown. Under each foot you will find a screw and under 2 of the stickers there's a screw. (6 in total)
Use a Torx 20 to unscrew these.

Remove the "foot" to access the screw.

Remove serial sticker to access the screw.

Remove warranty/MS sticker to access screw.

All 6 screws are unscrewed , remove them and make sure you don't lose 'em ;)

Now lift the top on the Xboxcase.

There you go ... TOP is removed and you can now see the DVD-drive (left) and HDD (right).

Go to PART III : remove HDD