There IS a method, O ye-all of little faith. One obtains 3x5 squares of purest vellum parchment (common copier paper may be substituted.) Then, between sunset and sunrise every night, one copies tables of the arcane tongue's declensions, paradigms, vocabulary, etc. By day, he silently recites these to himself while facing the long-ago land's direction. With diligence and attention, the magic should begin to kick-in within a twelvemonth or two.
The method works. I once met with a coven in the University of Texas' Waggener Hall for 6 hours a day in the summer. (For cover, the Ancient Languages faculty styled our rites an "Intensive Course.") By summer's end, we had covered enough Ancient Greek to let most of us take regular grad-level classes. Ain't that magickal?
Seriously, learning an ancient language is mostly a matter of well-planned effort.