They will probably want to talk to parents partners ect. I took my wife along and it made the process easier with her telling the psyc her observations about my daily behavior. She was able to tell him things about me that i thought where normal. Like loosing keys wallets sunglases constantly my long list of projects that are not quite finished. And so on. But that was the seccond appointment. It seems to be a long process in australia for diagnosis. I had 4 appointments with the psychologist 2 apponintmets for psycometric testing and so far 4 appointments with the psychiatrist for trialing medication.
Also they will want recent blood tests done and a clean bill of helth from your GP to make sure you dont have any medical conditions that could be causing / adding to your symptoms.
Good luck and stick with it if your diagnosed and treated it will hopefully make your life easier and better.