No Probs Fisheress, I worry a little about the same thing, but I just think, going ahead and taking the bit between teeth, shows NZIS (eventually) that you're willing and if you get job you're already influencing the country positively.
Bit worried about the visitor visas for other half and children also, but if you think about it, it's not like you would go 6months in UK without finding a job, if its urgent even if you have to settle for second best.
Obviously I know nothing about NZ teaching agencies but in the UK, you sign up to temp and you're placed within a couple of weeks. I'm sure teachers go off with stress left right and centre in NZ too.