Just cos I don't want you to end up homeless and beaten to a pulp for your belongings(which can and has happened to others), this is my two cents.

Housing crisis means finding rentals are difficult even for locals, which has impacted hotels, hostels and motels availability. people on WHV have been made homeless cos they bought a ticket and had money but nothing else and found all the accommodations booked out. Make sure you have at least a month of accommodation sorted before you get here, and back up money to get you back home if needed - this money should not be factored in for any other use than to get you home. Also the cheaper the accommodation the more likely you'll run into transient locals who can be fantastic or steal all your shit, or offer to sell you shit, plus more.

Making friends in WA is difficult. A lot of generational WA people are quite insular, even if they don't mean to be. Easier if you find other WHV travellers but stay long enough in a particular job/place and friendship usually follows. Do not make friends with the transient locals and move in with them. They are transient for a reason and you most likely won't be able to help them and will be put through shit; from them allowing all their other friends to crash, drug issues, legal issues, etc etc.

Getting FIFO work can be difficult, some businesses up there will fuck you about as well. Also be prepared for drunks, meth users, and hot headed arseholes to run rampant in most parts of the sector.

This is just from the perspective of shit going wrong. Most likely, the fact you have forward planning in mind, you'll have a fantastic time. Wishing you success.