I have been trying to teach myself piano due to the unavailability of teachers where I live.
I have usually been the "talented" student in school, and went on to a prestigious college. And I realized that teaching often fundamentally differed (was more analytical, relied less on examples and more on concepts, etc.) At some point, I grew so frustrated with teaching that I quit attending classes to teach myself the material and to learn using textbooks. And I see the same scenario play out when I try to find someone who can teach me piano. I have always rushed ahead through material -- reading textbooks before the semester starts, taking on difficult problems and challenges well beyond what was expected of me -- and I don't expect piano to be any different.
I can already play most relatively simple material (at the level of the easier Chopin waltzes and nocturnes, Schubert impromptus, etc.) and wanted to try and learn more difficult material: the Fantaisie Impromptu, Liebestraume, Chopin Etudes, etc.) which are "just above" grade 8 but not quite virtuosic (to be fair, the Etudes are viruosic...).
Most of the advice I find on learning piano is very generic (stick to a practice regimen, practice regularly, etc). It has been my experience that more efficient methods to learn a subject are usually those which the "talented" students apply. By getting a better idea of what those methods are, I thought I could improve my own learning experience. It would help me to get a good teacher. It would give me some perspective of whether my learning style is "correct", or if I'm just full of hot air.
I did not mention all of this initially as I hoped to not bias the answers by revealing my background. People are often not aware of what makes something work (tacit knowledge), so I hoped to try and figure out common patterns which may work, based on anecdote.
You said at some point that our questions are initially like stabs in the dark. If this question is silly, well, consider it a stab in the dark...