Before you buy hearing aids, you should see your GP to rule out any correctable causes of hearing loss, such as earwax or an infection.
If, after this, you still need to see an audiologists, get a referral from your GP. Remember, you are not bound to see the audiologist listed on the referral. Feel free to find and use an audiologist you are comfortable with.
You can seek out an independent audiologist in your area (which means the audiologist owns and operates their practice) click on https://independentaudiologists.net.au.