Neil, if you want to find or photograph wild native animals the best way is to find a likely area and visit it repeatly and get to know the area. I don't know Sydney but there would be heaps of suitable areas within a couple of hours. Very early morning is best but night walks can be productive. Walk slowly and quietly and listen. You will soon learn where the animals can be found. Spring is the best time in southern Australia as most reptiles are both hungry and horny (but it is also tick season). Damp warm nights are the best to find frogs and a surprising number of other animals. If you walk alone you will see more but must be very careful (carry an EPIRB and first-aid kit.).
Also a digtial camera is best (with rechargable batteries) and get the biggest memory card you can afford (I'm currently using a 1gb card, holds 303 photos at full resolution). With a digital camera you can't waste film and are willing to take risks. Take heaps of photos, you will proberly never get the chance again.
( Self promotion mode on )
Here is the link to my (still unfinished) web site
http://150.101.58.70/ . There are some good photos there (is that a Big-head Syndrome?)
Finally, I'm off this weekend to the flinders ranges for a photo trip. I expect to see
Central Bearded dragons (
http://150.101.58.70/thumbnails.php?id=Dragon_Central_Bearded_Dragon )
Tawny dragons (
http://150.101.58.70/thumbnails.php?id=Dragon_Tawny_Crevice_Dragon )
Sleepies (
http://150.101.58.70/thumbnails.php?id=Skink_ShingleBack )
Flinders range skink (
http://150.101.58.70/thumbnails.php?id=Skink_Flinders_Ranges_Skink )
Eastern Blue tongue (
http://150.101.58.70/thumbnails.php?id=Skink_Blue_tougue )
Hoped for species will include Western blue tongue, Painted and netted dragons and brown snake.
REALLY hoped for animals include the thorny devils , bycycle dragon and the Flinders range carpet python (Quote from Ehmann (Aust. Museum) pale - reddish brown with with broad tranverse distinctive buff (black - edged) patchs on the back and a very proinent wide, pale lateral zone for about a third of its length).