Go Here:
http://www.nicoclub.com/archives/nissan ... nuals.html
Select your year. For the rear panels, I can share they are found in the INT.pdf for Interior, starting on Page 31 for the 2010, "Luggage Floor Trim". Fairly easy to remove. I recommend use of a clip removal pliers and plastic fiber reinforced removal tools as you go. (some clips are too deep for pliers) Pull gently. You will need to remove the rear seats before you get the luggage side finishers all the way out. See the SE.pdf for the seats. Make sure you have the right tools on hand, esp' a torque wrench to properly re-install the rear seats when done. The torque values are specified in the service manuals next to bolts where it is critical. (Units are omitted, standard unit convention defined in general index, another pdf in the manual set.) For other items, and a general index, scroll to bottom of pdf listing and click on fwd.pdf. Most everything on the car is either 10 mm or T20. (90%+) Seats and other items are different, but always metric.
I am grateful to NICO for maintaining these manuals.
I have applied Dynamat to the wells from the inside and the quarter panels above them (to the extent of my ability to reach back there, and I contort pretty well, so it is good). HOWEVER, I have not yet achieved desired results. Once I accomplish my goals for road noise reduction I will share my findings in a comprehensive post that will probably be too long, so I'll likely post an abstract and then provide a link to an organized PDF guide with details. I am only halfway there but already have so much information to share that I wish I could have read rather than discovered. Hopefully worthy of a sticky when I'm done with it.
This note may be too late for you but hopefully it helps someone.