No you will not be able to afford it by working at a local Safeway/Coles stacking shelves or flipping burgers at Maccas/Hungry's.
However in saying so, 150 K is not much for a car these days. You just need to get a decent paying job, stop wasting money on booze, smokes, useless mods and partying... save, save and save.
Make sure you own a house before you go out to buy the GTR. And off course, dont be a dumb ass by buying it off the showroom for 150 K... wait anothr 3-4 years and buy it for 120 or so...
I'd love to have one next year, but currently I need to buy my first real estate... so the car can wait, plus I have my R33 to play around with... it aint an R35 GTR but still fun.