actually, if you just let the autopilot fly over the target it will do everything by itself.
I try to do this real life by flying in "spot" view looking down and guestamating it.
I did let the AI release the bombs for the current mission to bomb enemy troops in a front line sector. I was watching to see where the AI would release the bombs. I never saw anything that looked like a specific target, I just heard the whistle of the bombs falling. I had the TAC set to show "all" with a range of 1.1 nm. I could see the solid blocks that I guess represented enemy units. The AI released in about the middle so I guess that will be my plan for the future.
In this mission, the flight leader was Capt. "Jack" Salmond (HA) and the bombs did get some hits. Maybe he is just better than us plebeians.
In QC missions that have a well defined target, like airfields or railway yards, I have let the generic autopilot in QC release the bombs sometimes and tried to do it myself sometimes. The AI and I are both equally bad.
From my reading, most pilots were pretty bad at bombing in WW1. Of course they had very little training and only the crudest of bomb sights so that is understandable.