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Use the solar noon method and you will get a very accurate alignment.
Search for solar noon on these forums and you will find lots of posts on it.
But basically, find out when solar noon occurs at your location, hang a string on a plumb-bob and the shadow cast on the ground by the string at precisely solar noon will be precisely north-south.
You align your mount to that line and you are away. Mark the line on your concrete or lawn and you can always setup quickly.
Solar noon is at 1:31PM today in Melbourne, and at 1:30PM tomorrow. Anything that is truly vertical at that time will be casting a true North-South shadow on the ground.
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