It should appear as a bright star with an obvious tail. A good horizon, with not trees, buildings, etc., will be necessary to spot the comet. Over the next few nights, the comet will be swallowed up by the twilight sky as Hyakutake moves toward perihelion. While a few observers suggest that the comet is brighter than magnitude 2.0, most observers continue to estimate the brightness between 2.0 and 3.0 magnitude. The comet will only be visible from the Southern Hemisphere.
Dates are local to Australia.
I will update this as more is known about the light curve. The first thing that should be visible is the tail rising about 10 degrees north of due east. The head of the comet, perhaps 2nd magnitude will rise during bright twilight. Hyakutake will be about four degrees below and to the right of Mars. So far no positive observations have been reported.