Did the same SYD - Hunter in November and it wasn't bad. Re: wipers/turn signal --It's been a couple of months now and just the other day (here at home) I hit the turn signal instead of turning on the wipers.
Forget trying to parallel park--everything (mirrors, other vehicles) is in the wrong place. Once you get up to the Hunter, you'll be fine. Try Blaxland's Restaurant next to Tower Estate in Pokolbin. Excellent food, good prices.
Also drove the Great Ocean Road from Adelaide to Melbourne. Driving in the countryside is a piece of cake.