You seem to be stressing way too much thibault, as simmo said, most things are easy on the ground and many “problems” you see now are only in your imagination. Once there you can arrange almost everything by just asking. You can ask here but everything here is theory. Once there, you ask and people get things done for you.
With regards to walking up: you simply get up at 3.45, start walking at 4.00 on the road up, take any shortcut you can find that goes up and you”ll be enjoying parakeets and the sunset at 6.00 on the ridge.
That’s at least how I did it.
So the trail is shortcutting the road that is snaking its way up. Go up and it’s simple comme bonjour. You”ll see birds by keeping your eyes open. The trail itself has a lot of parts with ferns higher up (not many birds there). I saw a condor on my way down… even when walking up and down you’ll spend approx half a day so have lunch at the lodge. Make sure you can pack some breakfast / water by arranging it the day before at the lodge.