My little part of Aus doesn't have any really nasty spiders. We have white tails which are bad news not because of the bite but because of the bacteria they carry on their fangs, but if you keep your house tidy and squish any of the blighters that you see you're pretty safe. The other main venomous spider species is the redback, but those won't kill a human... just leave a nasty bruise around the bite site. We've got two main species of venomous snake, the tiger snake and the dugite, but they're pretty easy to avoid.
Tiger snakes are aggressive when cornered, but dine primarily on frogs, so if you don't want tiger snakes, don't have a fish/frog pond and stay away from wet areas. I've seen a few tigers in my time but never felt threatened by one.
Dugites on the other hand are VERY shy and will only bite if you really harrass them. Their prey of choice is mice and rats, so a clean and tidy feed shed and tack room and everything in mouseproof containers will generally deter them. If in doubt, install a South West Carpet Python, because those eat mice and rats too, are generally docile if used to humans, and non-venomous. Or, install a good barn cat.
In actual fact the animal in MY area you need to worry about is BEES. And mosquitos. Mozzies kill more people in a DAY than snakes kill in a year.
So basically... come to MY part of Australia, because nothing will kill you here. Unless you swim in the ocean [I refuse to], because we DO have Great Whites.