Here's a tip the locals use to avoid the ridiculous parking fees at Sydney Airport [domestic and international]
Make sure your mobile phone is charged-up and ON.
Confirm flight is on-time.
Drive to airport and time to arrive about 10 mins [domestic] 20 mins [international].
Park somewhere adjacent to Sydney Airport - Mascot [domestic], Arncliffe [international].
Wait for the call [OK I'm ready].
Proceed to designated meeting point.
Disembark from plane and proceed to baggage collection.
Turn on mobile phone or use a public telephone in the terminal.
Call your picker-upper on their mobile telephone and say "OK I'm ready". Go outside to a designated spot, say Departures drop-off. Your Picker-upper will be there directly.
Welcome to Sydney!