Feel for you and also roddymcleantattooer : http://www.350z-uk.c...mcleantattooer/
Dig a bit of a history search on here. No doubt this is not an uncommon issue and invariably crops up when the weather gets colder and has generally been put down to the mechansim seizing and having cleared the problem and a regrease that appears to have solved the problems, although sadly the feedback from those having the problem about how they sorted it has been poor.............. Something I feel we need to encourage more.
Moving on.......those that did say how they got in is the way ZMANALEX has shown, although bent coathangers have also done the necessary
Jixaman provided the best answer:
http://www.350z-uk.c...hl__+door +lock
This guide showing the door handle removal and have quality pics of how it works might help:
http://www.350z-uk.c...hl__+door +lock
And this excellent guide by SteveW relating to the electric window repair guide, but also has some good info and visuals to hopefully help you through what is what and how to do some of the removal and replacement:
Electric window repair guide.pdf
Hope that helps you and roddymcleantattooer and PLEASE do let us know how you got on resolving the problem as you certainlt are not the first and will certainly not be the last