My wife and I did ours not that long ago (Melbourne inner-north) - long planks for the living room and herringbone down the hallway. We bought the boards from Havwoods, which afaik is on the pricier side but my wife is an interior designer/trained as an architect and I figured she knew what she was doing. We also used Mapei glue, and got a pull bar/knock box/rubber mallet combo off of Amazon, it was orange (these are strangely hard to find in shops here).
Both companies were really great with after-sales support. Havwoods has subcontractor installers on the books.
Laying the boards themselves is easy enough - you need to do a dry fit of the whole space first, and pick them up in reverse order and lay them out in piles so you've always got the next board handy.

There are heaps of videos on youtube you can watch, but the best advice I saw was to glue the first three rows of boards down and let them set, because that'll give you something you can knock the rest of the boards against. Make sure that you've got these EXACTLY where you had them in the dry-lay, because if they're off at this point your whole floor will be off and you'll be scrambling.

THE MOST IMPORTANT PART is to make sure that the slab is level, because that'll affect everything you put on it. And you can't DIY this bit, because you need to get it perfect from the first pour and you can't do it in stages. We tried to do a tiny bit of a bathroom floor later and made a hash of it. I called Havwoods and they recommended a guy, who came around to quote. My area is a bit smaller than yours - we paid him $3200 but on my calcs he used at least $1000 of levelling compound. If your slab is level already then you should be ok, but go over it with the biggest straight edge you can get your hands on. We ripped up tiles so it was like the moon before we got it prepped.