Take a wire coat hanger and cut the two looped ends off so you have about 8" of wire in a 'U' shape. Insert the two points of the 'U' into the two small holes on both sides of the cassette unit and push home unitil they unlock the catches that keep it in the dashboard. Then pull to withdraw.
I just pulled mine out on the red stilo, i didnt need and hangers or anything. But had to be a little rough with it and a bit of wriggling left to right.
Caveman style worked for me aswell (several years ago). I used a cement trowel to start with, so I could get a grasp with my fingers. Very theft-secure install... eh!
haha i couldnt find my cement trowel when i did mine
erm... cavemen had cement trowels?... hold on cavemen had cars???