First off, you need that special star shaped screwdriver. I had to take the entire door panel out ( 4 screws + window controls + door handle plastic rim ) Then I had to cut the back of the plastic housing inside the door, where the speaker rests. Then I had to glue the tweeter to the small grill type thingie where the original tweeter was, using hot cilicone glue (the ones with the sticks and the gun). I put the component box under the dash near the fusebox. I wanted at first to tap into the original speaker wiring, but eventually i just connected the wiring to the plug which goes to the head unit. It was a bitch passing all the wires through the holes in the door though, they did not leave much room for anything over there. I had to take out some of the plastic on the bottom left of the driver's seat, in order to successfuly put the wires through. The reason why I'm asking what size speakers go for the rear, is because I do not want to take the rear door panel apart, just to find out which speakers I need to order. I want to order the speakers, and then take the panel apart. With the components I put in front, I had little choice, because I already had those speakers in my possesion. I was lucky I guess. I read that the picasso has different speaker sizes in front and rear, that's why I'm a bit paranoid. By the way, can someone recommend a good set of 6.5" speakers for the rear? just regular 2-way , not component. I was thinking FLI, or maybe Cerwin Vega