Sailing Fiji

If so any idea how much would it cost, or if you want to fly if it dear

There are cruise ships that do this if that's what you mean. They would take you as a passenger in a sense. Some of them will go to New Zealand as well. The ship leaves Sydney, Brisbane, sometimes, ask the cruise line for hours.

Yes, you can pilot a boat in New Zealand from Australia, people come from all ranks, it took months to do it well. You have a large motor yacht? 40 feet long or bigger? You can navigate around the world, but the Southern Ocean has always been a little hard on the sailors.

If you mean a dinghy, say, a 18 footer, it would be possible, but distances are thousands of miles (kilometers) so that it is not a walk in the afternoon.

Sure ... the sea is strong and there are lots of sharks and things - but it is certainly possible.

There are many cruises advertised for about $ 3,000 but it depends on what you want. You do not see much time is devoted to the sea and you get to see the port where you stop. You can get packages to fly ie Brisbane, Australia to Fiji for a stay of 4 nights in a hotel in Nice would cost about $ 800 Virgin Flight NZ same, you can pay much more, but special leave very often. You can get a flight to Brisbane for about NZ $ 400 sometimes.

yes
a guy from my school was the youngest in the world to sail around the world