If you don't like gutting, simply run a filleting knife (you do have a filleting knife, right?) round the back of the gill cover (J-cut), hold the tail, go in just forward of the tail, down to the spine, turn the knife through 90° and run it up the the gill cut, keeping the knife against the bone all the way. Flip the fillet off onto the chopping board and clean off any clingy bits. Flop the carcase over, and repeat for the other side. It's not quite as efficient, and leaves some meat behind, but if you don't like the gutting, it saves the hassle.
An alternative method is cut the belly from the anus up to the head, cut through the spine behind the head and gills, and pull the head off. The gills and guts come with, and you can just give the cavity a quick rinse.