Speaker replacement

[DJW svx]

It would appear that the speakers in my car are crumbling to pieces, Fortunately I have some large speaker suitable for the rear that came out my Pajero Evo and with a bit of cursing have got them in the rear. My car is the CXD with the Panasonic double unit and the cd caddy in the rear. I've popped out the front component tweeters and they fell to pieces but I'm having a problem getting the door cover off to replace the 4-5 inch speakers which are also flapping about does anyone know how to remove the door card? so far I've removed to two screws and popped the fixings but it wont go any further and I don't want to butcher it, also any idea what the wiring is, the tweeter has a resistor am I right in thinking thats signal and the other is earth?