2007 Altima stereo

I have a 2007 altima with stock stereo (not bose). I am looking to replace the speakers and add an amp to power them. I was wondering if anyone knew how to get they're hands on a wiring diagram for my car, also i would like to know how to get at the back of the stereo w/o breaking the dash. This one looks tricky.

All I can get is info on the 06. I have NO idea if they are diff.

+12V DC Battery(Constant)	YELLOW /GREEN		31	15 Amp	Fuse box on left front of engine compartment, near battery.
Switched Accessory	Purple		6	10 Amp	Fuse block behind left side of dash
Power Antenna	NCA	Green for antenna signal
Illumination	RED / yellow & RED / blue
Steering Wheel Control Wire	RED / white, green, and blue	If equipped, as for Mid-Line.
Left Front +	Blue/white
Left Front -	Blue/red
Right Front +	WHITE/ black
Right Front -	Blue/black
Left Rear +	GREEN/ YELLOW
Left Rear -	BLACK / YELLOW
Right Rear +	Blue
Right Rear -	Red

AT SPEAKERS

Wire Function	Color	Note
Left Front Tweeter +	Blue/white
Left Front Tweeter -	Blue/red
Right Front Tweeter +	WHITE/ black
Right Front Tweeter -	Blue/black

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