The Villa-Lobos Etudes are superb, but they are fiendishly difficult and, to avoid injury (especially to the left hand) should only be tackled under really competent professional supervision. To give you an example, have a look at No 10 on Youtube at : https://www.google.co.uk/search?q=villa ... 8AeovaLQCg
... or check out No 2 at : https://www.youtube.com/watch?v=fEHjD4CyAU8
... or the very beuatiful No 11 at https://www.youtube.com/watch?v=r21WDZ4-eUI
... Obviously, only recitalists can play them at these high levels, in the same way (speaking purely technically) that, on a tennis court, only top professionals can serve at 140 miles per hour (225 km/hour!) ; of course, speed is not everything, but Villa-Lobos markings of "très animé" (No 10) or Allegro (No 2) are very daunting in the respective contexts. If I were you, I would first check and see if your left hand has been fully "configured" (stretched) to the fingerboard ; for instance, in Etude No 2, bars 4 and 5 : can you comfortably play all the notes AS WRITTEN, i.e. respecting the exact duration of the bass notes (this will require serious stretches. If you feel you are ready, have a go, and you will be in for quite a few years of agony and ecstasy ... after which you will probably be ten times the player you are now.