Superhuman has chosen one of the Best Albums of all time. Truely a musical Masterpiece and one of Friedman's legacies, but I also give due credit to Mustaine by his incredible way of picking and rhythm techniques in time signatures. Holy Wars is a definite challenge to master the technique for players @ any level. Once it has been mastered, it will make anyone a better player overall. Many other songs will seem less challenging after that experience has been gained.
So, I say aim high and tackle Holy Wars in it's entirety, taking all the time necessary to accomplish gaining the skill level. You will be happy with the results from the time invested.
Good luck