If you don't have a working key, then Nissan needs to get the code and manually program the chip. If you have a working key, you can quite easily clone it. Build quality on this is just like OEM.
Not a fan of cold crankIng. As long as the fluids are in relatively food condition, I wouldnt bother. Just be gentle until everything starts flowing like it should. Then you can really give it to her.
Does that sound sexual?