I did the first oil change on my OB @3 weeks ago. I used a 1/2" ratchet with a 14 mm socket, fit it on the drain plug firmly and smacked the end of the ratchet with the palm of my hand. It broke free after a couple of smacks. I am always nervous about cranking on bolts/nuts in restricted access locations. The 1/2" ratchet is heavier and smacking the end provides impact action to loosen the drain plug.
Separately, I was worried I would get oil splashed everywhere on the splash shield, but it is designed well and oil flows out in a reasonably controlled manner. Just dab clean a few splash drops here and there after the change. Pretty easy oil change on this car.