Hey there

Realistically, you won't be playing an etude if you don't find it difficult

It really all depends on your dedication, strengths, weaknesses, and of course, time to learn it.
I mean, if you have small, agile hands, you obviously going to find a fast etude for small hands easier for an etude with large chords and octaves.
I think the Chopin Etudes will be a brilliant place to start looking: (I'll just mention some that I find easy enough?
Op 10 No 3 is slow, and relatively easy in terms of technique.
Op 10/5 is slightly difficult, but is popular with really amateur pianists.
Op 10/12 is also slightly difficult, esp. if you have a weak left hand.
Op 25/1 is considered easy, I think it is as well, also easy to memorise.
Op 25/2 I've never looked at this one, but it only seems like mixed rhythms, I think this one is really boring.
Trois Nouvelles Etudes No 1 Rarely played, seldom mentioned, it's probably the easiest though and I think it's on the Trinity Guildhall Advanced Certificate (somewhere around Grade

Liszt:
Tbh, I think Gnomenreigen out of the Two Concert Etudes will be easiest.
Transcedental Etude No 1 is quite tough, especially if you haven't played any Liszt or Etudes
Morton Gould: Boogie Woogie Etude - I'm in love with this, I'm not quite sure how difficult it is
Rachmaninoff: Etudes Tableaux No 7 I think is quite easy, but not very impressive.
Let me know what you think of these, and good luck
