Hi Karen,
Good choice!!
On the 13th January departure for the Australia leg of your journey there are 13 travellers and for the New Zealand leg there are currently 29 travellers, of those there are 5 travellers doing both Australia and New Zealand.
On the 2nd March departure for the Australia leg of your journey there are 10 travellers and for the New Zealand leg there are currently 10 travellers, of those there are 4 travellers doing both Australia and New Zealand.
For the 13th January, it looks like there are a couple of places remaining, but as part of this tour is on request you will need to speak to a holiday advisor.
Kindest regards
Monty