Batting first or second makes no difference to the nett run rate.
See what NZ did to Bangladesh the other day? That's what we need to do to get our nett in positive territory.
For example: yesterday we had to bat at around 4 rpo to reach the target. We managed this, slightly ahead of the 35 overs. If we'd reached the target in 20 overs it would have made far more of a difference to our nrr.
I still believe though that the other big teams all still need to face Aus - which will lower their NRRs.
Also, as long as we keep winning our NRR will improve, and be less of a factor.
