If you're concerned with the LH, well that's as friendly as Liszt's leaps get. Any time it's over an octave it's on a black key. It's gonna have to be 5 each time. Just try not to use your 5 anywhere else.The less you need to use your eyes, the better. Since both hands are leaping it's a case where if you practice hands alone but don't try to get your eyes off your hands, it's gonna be real problematic to play them together. While you work on just RH or just LH, try with your eyes closed (you'll probably have to go slower.) After that's more comfortable, start to build it up with both hands at speed one beat at a time.
I haven't played this waltz but other piece with big leaps recently. What helped me was practicing the part with leaps slowly, hands separate and hands together - always much slower than I could play the rest of the piece. Doing this constantly, every day, helped. Even when I was not practicing this piece in given practice session I would just spend some time practicing only the parts with leaps. Always practicing slowly, not trying to play it at tempo. I find everything must be "in preparation" when I am playing so one has to be ready for the next difficulty, like the leap. That said, I looked for moments when I could quickly glimpse at keyboard where given hand was going to play leaps just shortly before playing the leaps.
I mean the gestures of the hands are note exactly the same, and that told my instinct to not spend all the time with slow practice, but I will give a try of your approach.Thanka for your comment!
There is a simple "trick" to this, which is keep your elbows to your side and play the LH with a slight "curvilinear" movement. If you move your upper arm, i.e. the entire arm laterally, it just slows you way down and not only is it unnecessary and more difficult but much less accurate. Similar with the right hand... I play the first note in the right hand with the index finger then the higher octave. This enables you to start the single note with the hand "left facing", then move the hand slightly to "right facing" to play the upper octave. This combined with slight forearm rotation and a good bit of the distance and difficulty is subdued. It sounds a bit counter intuitive but its much easier than playing the first note with the thumb! The whole point is to avoid "leaping" or "jumping" and instead do geometric curves using the forearm's natural ability to rotate.