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Easy peasy Paul.
Choose a set of Galaxies, image them. Then go back to the same Galaxies in 2 weeks time then image them again. Then you play "Spot the Difference".
If there is something new in the image, that's when it starts getting serious. It needs to be reimaged to make sure it isn't just a transient occurance. If it's still there it has to be verified by others in the astro community. This is where it helps to have a network of other SN searchers who don't mind being dragged out of bed at 2am.
And if they also see the suspect in their image of the Galaxy, a notification is sent to the appropriate authorities.
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