I've bought some cheap 5 1/4" (13cm) Fenner speakers for the rear doors on my Picanto. It has space for speakers with a plastic grill but there is no speaker in there - I wanted something to fill the space.
Can anyone give me any tips on installing these, how to take the door panel off, etc? (I've never removed a door panel, ever!

)
Also, the stereo deck has wires for the front and rear speakers (connected), should the wires already be inside the rear doors, or do I have to extend them from somewhere?