This piece doesn't take that long to learn or memorize. However interpretation technical difficulties may take some practice. I too was taken by this piece, and challenged myself to learn it. Learning and memorization only took me a few days. Interpretation - far longer.
Yes there is a Guitar arrangement. I highly recommend you listen recordings of it. This piece is modeled after guitar playing so it will give you some idea on stylistic awareness.
As for the piano arrangement. There are two different versions as far as I am aware. First one is published by International Music, and the other by Schott. The International version is the one listed for Performers ARCT.
My teacher recorded the entire Suite Espaniola and I believe she used the Schott version. I use the International version, for reasons of ARCT. However the more I study the score, the more I see the Schott version has some advantages.
As to the chord jumps: The actual main focus to the listener is the chord on the main beat. They sort of have to be "snapped" to give the correct feel, you have to think you've arrived at this big moment with each chord. The piece does not have to be played metronomically, so yes a slight slow down is acceptable. The slow down is the best solution, as the alternate of making pauses does not sound as secure even though you may feel it (I worked this out with my teacher).
The first couple of weeks, just get used to grabbing the notes of the chords and the relative arm movements you need to make. Your security in this matter improves over time, so don't ponder on it too much.
The issue of "where do I look!???" There's the stuff in the middle, then suddenly the stuff on the outside. You may all of as sudden find what you are playing is not within your visual window with the hand seperation being so wide. What I do is when I'm playing the in the middle, quickly glance to the Left then Right in preperation of the big chord. Let your limbs memorize their target from this quick glance. When I play the big chord, I look in the middle in preperation for the return. The idea is prepare - look before hand because there is little time to look during the operation.
An excercise: without playing the keys, practice moving from middle, to outside chords, to middle to outside chords. Slowly at first, then increaseing speed. Don't play any notes, just concerntrate on positioning hands above correct notes.
Then there is the issue of alternating hands and repeated notes. This can be quite taxing at times, so take breakes if you feel tense. For the alternating hands bit, think firm fingers but flexible wrist. Don't try to play the repititions too loud at first, this will tire you faster. Keep close attention to tension in the wrist and fore arm, if too much tension appears, relax the hands. It is very easy to get caught up in getting the big jumps and forget about your wrists and forearms, and by the time you notice you might start feeling pain. So be careful with this, again take frequent breaks.
Above all else enjoy playing the piece. It's really fun to play, and audiences love it.
Topic: Leyenda