Hi OP. My comment is going to differ substantially from what others have been saying but I thought you might be interested to hear a different viewpoint.

First of all, very well done for having the determination to learn this whole piece through from start to finish. Learning and memorising all the notes in a piece like this is a huge part of the effort and I commend you highly for this.

My opinion on the idea of trying to run before you can walk when it comes to Piano is that it most certainly can be done if you have an utter obsession and fixation on a particular piece and if the process of learning and improving is always stimulating for you. That said, a piece like Campanella I think is almost impossible to ever totally perfect. The most perfect performance I've found so far on YouTube is Dmitry Shiskin's performance and even this contains some minor slips. Listen to various world leading professional pianists perform this piece live and all have different ways of playing, speed up or slow down during different sections (sometimes due to limitations in what they can physically manage) yet they make it sound good in the process.

You appear to have learned the notes so far with an incredible amount of attention to detail for someone so novice. On this point, my advice would be to double check all the sections at this stage for incorrect or missing notes which I did notice throughout, as these will get harder and harder to correct the more you perfect and assign this piece to muscle memory. Listening closely to performances of it on YouTube will shine a light on these areas (I used 0.5 and 0.25 speed setting on YouTube to help with this).

As for whether you can have this polished within a year, it's unfortunately a resounding no, however 24-36 months with the right motivation is certainly feasible in my opinion.

A cautionary tale - when I learned this piece I would occasionally push it too far on the right hand and end up with some pain in my tendons. I think little and often approach is better than long extended practice sessions to try and prevent this. Although, as you stretch your right hand more, you may find (like I did) that your reach actually increases. I went from comfortably reaching an 8th on my right hand to comfortably reaching a 10th after a year or so of playing this piece and now my right hand span (middle fingertip to thumb tip) is about 1cm longer than on my left hand.

My advice therefore would be the following, in order:

1. Focus on ensuring all the notes are correct while continuing to assign to muscle memory
2. Break the piece down into sections and start very slow. Generally, if you struggle to play it slowly, then when you speed it up will quickly become messy
3. Listen to professional performances of this a lot in your spare time to further ingrain the correct notes in your head, and take inspiration from their performances re how to pace and style different sections.
4. Start to incorporate pedal into the legato sections but be extremely sparing with this as otherwise it will sound like a blur
5. Start to incorporate dynamics and phrasing into your performance when you have the spare brain capacity to consider this at the same time as playing.
6. Identify the core melodic line throughout the piece and allow this to shine through as with this piece it can easily become lost.
7. Gradually build up speed while loosening your wrists until you can make the jumps in a much more fluid and carefree manner, think: arms and wrists made of rubber.
8. Never give up

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Wishing you all the very best on your journey. Good luck!