The calculator GC linked is interesting, but misses a few things besides labour and tipping. It's presumed the posts are supplied with triple mortising.
- Nicking (bevel cutting the top corners) of posts and palings
- Concrete
- Posts are cited as "100mm" so presumably not the NSW common 150×50
For NSW prices on materials you might look at either Ace or Rouse Hill Landscape Supplies besides Bunnies. The latter have rail mortices offset so the palings are flush with one post edge.
I sympathise with the six neighbours; I have five in Sydney and re-fencing is always a balancing act - you try to delay renewal until requiring a good length all in one job so it doesn't look "bitsy". Some I did myself, others were by Ford nut Barry Gibson (look for the ute registered BG-351). All mine are painted, it helps them recede and thus the yard looks larger.