Hi there,
There shouldn’t be any problem getting a Working Holiday Visa if you’re between 18 and 30. And it’s dead easy to apply online but make sure you apply in good time; according to their site 75% of applications are processed within 15 days and 90% within 44 days~but that means 10% aren’t!
https://www.homeaffairs.gov.au/trav/visa-1/417-
It will cost from 440 AU$ and remember to make sure your passport is valid for your entire stay plus any time you will be travelling home. Some countries are picky about the length of time remaining on your passport.
Hope this helps.