ob·ses'sion: something that preoccupies the mind excessively.
...it might have happened to you: (a.) you go to bed and just before falling asleep a thought pops up "...that ledge is doable! You just gotta take it from this side, pace your stride, maybe double-zzzzzz...", or (b.) you walk to school/training/work every morning/day/week-end, you pass in front that one spot, and you know it: "I can do that!", or finally (c.) you just watched that video for the 1,037th time, and -after going back to 0:53 for the 7,894th time, where that guy/gal busted that split second impossible/original/inspiring 'move'- you feel it in your whole body: "I have it! I want to go out now -1:24AM- and do it!!!".
Well... think again.
You don't have it. You may be able to do it once without damage, and eventually improve it, IF you get over the obsession part of it, and instead start approaching it as you would any new technique... progressively.
Then again... sometimes you just won't "have it".
Bring on (and document!) your experiences... I'll start out.