For years I made crab cakes or salmon patties by hand. They were tasty, but definitely lacked finesse. To improve my technique, I started using a big rounded ladle or measuring cup, which definitely helped.
But for really pretty, perfectly shaped patties, I had to buy these little egg rings. You just set them on the parchment paper, fill with the mixture, and pull straight up. They make my little anal-retentive heart sing. :)