First up - open all your doors, boot and bonnet and then remove the -ve post of the aux battery (I didn't remove the MSD, but can if you want)
Secondly, remove the trim piece under/behind the glove box (not bolts or clips, just give it a yank) drop the glovebox (empty it, it requires a shoogle), 4 screws at the top, 4 at the bottom - it then requires a decent shoogle (pulling downward/to the rear of the vehicle), disconnect the wiring for the glovebox curtousy light and airbag keyswitch. Fire the glovebox out of the way (I used the back seat extensively haha)
Third, locate the BCM, it's slightly closer to the floor than the fuse panel and 3-6 inches forward. It has 4 plugs (2 white, 2 black) coming off of it and all plugs face in toward the center console (see ref below).
Once located, I used a _big_ flathead to pry (including some light hammering) the entire module off of the metal brackets and then remove the wiring once it is loose, there are 2 types of connectors, each with 1 white and 1 black - I found the sideclip ones almost impossible, but got decent at it with some small jeweler screwdrivers as podgers.
Dont buy a new one, they need coded to the car for sure (or more accurately I think it's to the key)
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Apologies if some of the above is like sucking eggs - leaving it here for posterity too.
BCM reference: https://www.ebay.co.uk/itm/2015-NISSAN- ... 4126516664
(without the yellow)