Your questions are more than welcome here. I enjoy it. If I don't have time there may be a couple day delay, or if I travel. Fire away.

If a client has a sense that something may have happened but isn't sure and wants to do detective work we have to be careful. Its not wise to assume there is a trauma or that something specific happened or certainly by whom.

A sensation can be targeted, but only if the person isn't DID. If DID, its a long different story.

If not DID, its safest to go by whats functionally not working, identify the NC and PC, and float back to the earliest known memory of that negative belief.
That's the standard protocol.