Is an appointment for HK Passport renewal needed to be made ?

Hello again. I have tried a few times to ring the Brisbane office but can't get through. Do I need to make an appointment to renew my Hong Kong Passport in Brisbane ? I have all the forms completed and photos etc. but have to travel from Gold Coast so didn't want to waste the time if I needed to make the appointment before attending in person in Brisbane. Also, can the Hong Passport Renewal be handled by sending to the Brisbane PO Box by mail ? If so, how does the Passport get sent out to me or do I have to go into Brisbane to collect ? If it gets sent out to me, do I get a Notice in the mail - then collect from the local Post Office (showing my ID) or does the Passport actually get mailed direct out to me ? I don't think mailing direct to me is very secure for a Passport. Thanks in advance for your replies to the several questions asked above.