Place a shaped piece of 12 gauge wire on your bench block/anvil. Hold it in position with your less dominant hand, begin hammering with the smooth head of your hammer. Starting with the centre of the small spiral, work your way methodically around the shape. I have used a large 'S' spiral.
I like to hammer the outer rotation of the spirals slightly more than the loop in the centre, adding additional contrast. Follow the wire round, using many small taps, rather than one heavy pound, to ensure an even finish.