Preparation is a choice you make on the days when nothing is on the line.

By the time it matters, preparation is over. What you can do under pressure is only what you already built when there was no pressure, on the unremarkable days when nobody was watching and nothing was being measured. That is the inconvenient part. The work gets done when it feels least necessary.

Put one low stakes rep into this week for something that matters later. Run through the presentation once alone, do the drill on an off day. It will feel unnecessary, and that feeling is the whole point.