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Everything kinda looks involved in the Sentra. To remove the head unit, you have to partially disassemble the center dash. To replace the front speakers, you have to take apart the interior door frame. To replace the rear speakers, you have to take apart the rear deck.
It can be done, but to me, it looked complicated, and people on the b15 sentra discussion board (the discussion board address is: http://www.b15sentra.net/UBB.html ) were saying that they broke a few retaining clips trying to pry out all the panels. I got a package deal for my system from a local audio shop, and installation was included. The install was pretty cleanly done, and the system sounds clean. You're welcome to take a look at those direction sheets and see how and if you can handle it. If you're just going to upgrade two speakers then it might be worthwhile to attempt the installation on your own, but if you want to do the whole system, I would save some time and grief and just have the store do it.
In my MX6, the head unit just slides out of the dash, the rear speaker screws are under the grilles that just pop off. The front speakers are more involved, just like the sentra- you have to take the door frame off. Good luck, and keep us posted how and what you do.
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