Prepare once. Reuse what you learn.
The book teaches you how to approach the conversation. This is where you prepare the evidence you will bring into it.
Don't ask only: “Have I done this exact job?”
Ask: “What behaviour sits behind this requirement, and where have I shown something similar?”
One story can prove more than one thing. This shows which behaviours you can already evidence, and where an interviewer would find nothing. Tap any behaviour to see the stories behind it.
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JD → Requirement → Evidence
Translate each line of the job description into the behaviour behind it, then point it at something you have actually done.
Evidence Bank
Don't prepare thirty memorised answers. Prepare five to eight real stories you understand properly.
Debrief
Do this while it is still fresh. Not to punish yourself, but to turn the interview into data you can use next time.