I guess part of your answer would depend on your learning style. For me I have to go though a selection process (need more reason than just loving the song, but that's where I start), then I HAVE to write it out 2 or 3 times (otherwise it doesen't make it through the skull), then I'll learn chorus, then a verse at a time, I also need to sing it while driving, sometimes taking days, this is for me a forming or styling of how the song fits to my voice or how my voice feels with the song, finding where the compatability lies is reinforcing my memory. If I'm not happy with the song & how I do it, it's not worth trying to make it work, I'll never own it, never love singing it, never really remember it. The only way for me to keep it is to internalise it, make it part of me & sing it & to keep singing it. This may sound a little to simple or stupid but it's what works for me, I'm sure each has there own personnal method & style of how they learn. Barry