Today is one picture: what fear actually does when you stay. You know the first half of this curve intimately. The second half you have never seen, because escape has always come first, and the whole program is arranged so that you finally watch it happen.
Picture a graph. Along the bottom, minutes. Up the side, fear, zero to ten. Now put yourself near the feared thing and watch the line.
First it rises, fast and steep and genuinely unpleasant. Everyone knows this part. Then it peaks, and the peak has a ceiling: fear is a body event, and the chemistry that drives it has a maximum output and a limited tank, so it cannot climb without end.
Then, if you stay, it falls on its own, with no technique, no trick, and no one talking you down. The alarm blares, scans for the catastrophe, finds nothing arriving, and begins, minute by minute, to power down. Fear that peaks at eight drifts to six, then five, then four. This is called habituation, and it is as reliable as tiredness after a sprint.
Escape always came first. Every time, you left at the peak, the worst possible moment, so your memory holds thousands of rises and not one completed fall. Leaving at the peak also teaches the alarm that escape is what ended the fear; the curve gets interrupted at exactly the point where it was about to teach the right lesson. So your alarm's file reads: fear rises, catastrophe looms, escape saves. The final page, the one where fear falls all by itself and nothing happens, is missing.
Every rung of your ladder is the same assignment: stay past the peak, let the curve complete, and log it. Fear before, fear at the peak, fear after, and the number that will become your favorite, minutes until the fear halved. Do that repeatedly and two things happen: each curve falls faster than the last, and the peaks themselves shrink. That is the wrong lesson being overwritten, in your own handwriting.
You do not need courage in heroic amounts. You need one curve, completed, at a rung you chose, and then another one. The falling does the rest.