There has been some discussion, but no definitive thread on the procedure exists yet, so i took some pictures and changed my reduction gear oil. It really is a straight forward procedure almost not requiring this thread, but if you are 50/50 on doing this yourself then this should give you the confidence you need:)
first off, tools
you need a jack to jack up the car
edit: a jack stand to hold your car up while you crawl under it
you need a 10mm socket and a flat head screw driver to pop off the tray under the car
you need a 10mm allen wrench (preferably with 1/2 inch drive) and a breaker bar to loosen the fill and drain plugs.
you need a 13/16" socket to take the driver side wheel off for easier access to the transmission area
you need a 1/2" OD hose and a funnel to fill the transmission with the new fluid.
2 quarts of Matic S or equivalent fluid (i used Redline D6 ATF)
if you want new gaskets for the fill/drain plugs then order those from Nissan. They are metal washers, i reused mine, didn't have a problem.
a screenshot from the FSM, the torque spec for the plugs is 25 ft-lbs
jack the car up on the drivers side at the jacking point
take the undertray off
locate the drain and fill plugs, drain plug right below the driver side axle, fill plug to the right of it
pop them both loose with a 10mm allen, make sure you can remove the fill plug before you remove the drain plug.
mine had surprisingly little residue on it, i am ok with that. I don't know if the dealer changed the oil after the lessee turned it in but i doubt it. this picture is with 44k miles on the oil supposedly.
the oil itself didn't look Too black when dabbing with a paper towel, but it was dark flowing out when i removed the plug.
route the tube and funnel into the fill port and put the driver side wheel back on and level the car. put about 1.5 quarts of oil in there until it starts dripping out. Then remove hose, let the oil level out and install the fill plug.
Note: After putting in the fill hose but before filling up, put the driver side wheel back on and lower the car to the ground so it is level. Have an oil pan under the fill hole so that you don't make a mess once the gearbox is full.
Button up the undertray and go drive around the block. Nothing should appear different if everything went well. Check for leaks after the drive. This took me about 1.5 hours leisurely, including driving around the block afterwards.