Back-up camera realignment help?

Hey folks -
My googlefu is failing me so hoping you can point me towards some help on re-aligning my backup camera. At some point over the last couple months my image drifted to where it's like 1/2 license plate now, not terribly useful.

From what I gathered so far, I have to open the camera housing, and then go from there. Just want reassurance that I'm on the right track before I crack it open and it completely goes to hell.