The problem was never the trip. It was where the plan lives.
You booked the flights weeks ago. The hotel confirmation is in your email, somewhere. The restaurant a friend recommended is in a chat you have already scrolled past. The packing list is in your head, mostly. Each piece is fine on its own — the trouble is that they never live in the same place.
So the week before you leave turns into a scavenger hunt. You re-check the same booking three times because you cannot remember if you saw the right one. You lie awake wondering whether you forgot to arrange the airport ride. The trip is wonderful; the run-up to it is quietly stressful.
The fix is refreshingly ordinary: one folder, a simple day-by-day layout, and a packing list you reuse every time. That is the whole idea — and it is the whole product.
You do not need to plan harder. You need to stop losing the plan you already made.