I tend to group 'Preludio', 'Paysage', 'Vision', 'Eroica', 'Wilde jagd', and 'Harmonies du soir' in the 'less difficult' side
Obviously what is difficult for one pianist is not necessarily difficult for another, but 'Wilde jagd' is generally considered one of the less difficult of the TEs. I can't really rank all twelve, but I tend to group 'Preludio', 'Paysage', 'Vision', 'Eroica', 'Wilde jagd', and 'Harmonies du soir' in the 'less difficult' side and the A minor etude, 'Mazeppa', 'Feux-follets', 'Ricordanza', the F minor etude, and 'Chasse-neige' on the 'more difficult' side. That's not to say I can play any of them proficiently except 'Paysage' and perhaps 'Preludio' on a good day, but I can sight-read most of the first six and almost none of the last six.As for special technical requirements, it's something of a grab bag of techniques, as are all of the TEs to some degree, but hand independence is particularly crucial during the hemiola passages halfway through the piece and near the end, and the flying octave leaps in the right-hand just before the second hemiola passage take a bit of practice. I'm not quite sure what to say about the descending chromatic scales near the beginning - you need to hit every note without losing the momentum of the piece, which can't be done easily using traditional chromatic scale fingering. I've seen varying opinions on what constitutes an effective approach to those scales - 5-1 twice over, not worrying about hitting every note as it's the gesture that is more important, etc. You may need to experiment a bit to see what works for you. That aside there's not too much tricky stuff - just, as donjuan says, the intimidation factor involved in playing it Presto furioso. Confidence (and not C minor ) is key in this piece.Take these observations with many grains of salt - my own rendition of this piece is dreadful, though I've been trying to work on improving it.