I had read somewhere that the camera is calibrated to the hitch, and the slight offset is adjusted for.
A trick I learned was that the two screws holding the inner tailgate panel on are centered to the hitch. If there's an equally centered screw or if you put a dot or sticker on that spot on your trailer, you'll have an easier time lining it up even without the camera.
The biggest issue is tire size. The larger the tire, the more distance it travels per revolution, (or 1/16 revolution) and if you oversteer, it's easier to overshoot your mark before you realize you've moved.
Practice helps. And remember, no one is grading you, except your neighbor, but no one likes him anyway. LOL.