If they hit New Zealand, it is likely only in the North Island, so I reckon I would be ok. On the flip side though, we have few guns, and other weapons around would be very basic. Our military is pretty basic and mainly goes on peace keeping duty, so they probably wouldn't be much help.
We are a pretty DIY nation, so building up protections as a group of survivors would be ok, and it doesn't take long to get out of the city and into the bush.
Probably a few other countries or areas around that are similar.