Not a therapist, and probably not recommended; make it an option if you're actually desperate.
Because it can be risky in some cases, and not guaranteed to work if it does not progress pass just remembering unless you can afford to risk it again if risks exists.
Get a safe place and time. Preferably somewhere comfortable.
Better if you have an emotionally trusted person nearby.
Take a medication for something that quiets down distractibility or lowers your guard down if you had to, so it'll lessen the chances of playing recollections in the loop needlessly.
Experience the whole thing head on no matter how painful. Detail by detail.
But the story is not the point, the point is your mindset or state while recalling it.
Do it as if you're curious why the heck your head just chooses those crappy memories in the background and keeps popping out.
Because, really, if you don't like that memory, why does your head keep chosing it? It's possible your head is also hiding something with it, too.
If you sense a feeling behind it, process it, feel the whole thing, listen to it's "reasoning".
It can be so absurd or outright nonsense, but try to validate it or recontextualize the whole thing.
Then assure the whole thing that made that story over and over wholeheartedly like a kid.
You can have someone else with you for this if you don't know how to recontextualize yourself. This phase can sometimes take multiple sessions.
At least those are actionable steps.
And why I say "desperate" than "ready" instead usually makes it somewhat riskier.
Else, tell a therapist (one you actually trust, the better) you want to take it on head on and may help you to guide you with the process.
That is, if you are actually willfully ready. Though, this is a safer route.