open the big dash board by the down; pulling quietly with a screwdriver, u've got 2 holes to place ur screwdriver, then u've just have to take the dashboard, u've got all the access u need to the stereo units....

The easiest way I found to open the center console is the following

Find one of the little accesories "plug in" covers. (little rectangle plastic covers-ussualy black), take it of with a small flat screwdriver.( the ones for fog lights, etc but not used)

with that off you´ll have a grip for pulling off the central console plastic cover. pull it off gently with the help of the srewdriver.

I use this technique ´cause it is more unlikely to leave marks in plastic cover.

Remember....be gentle