Generally I learn from recordings first, paying attention to everything, but especially phrasing. I usually try to get a vocalist's rendition as well. Afterwards, if I might go to the music if there's something tripping me up or I can't quite get all the right voicings from the recording. Usually I'll end up making my own sheet directly from the recording as well. I try to use recordings first that are the original changes, then I'll deal with different changes. Then I try to learn all the words. Experiment with substitutions, transcribe solos, analyze the tune, play it.