The best thing is to keep grass short. Snakes don't like short grass - nowhere to hide from birds.
The same goes for clutter, if you can't keep it tidy keep it away from the house.
The vibrating lawn spikes don't work. My sister in law bought them only to find the snakes coiling up around them or on them. Our neighbour had a similar experience.
We have a lot of snakes here. Mostly copperheads. We have a couple of dams which are the ideal environment for frogs (obviously food for the snakes), and we have a lot of dry stone retaining walls, which are a good place for both snakes and frogs.
Snakes don't bother me too much, but Lyn seems like most people and doesn't like them (i.e. has an irrational fear of them), so usually if we see them, then the lawn is over due for a mow.
As unhelpful as it is, my personal attitude to snakes is "We are in Australia. Get used to it."
They won't harm you if you leave them alone, and you can set things up to keep them out of your way.
Al.