Q: How do I identify individual harmonies in a song if I don't the solo tracks?  Do I just have to have good ear?  Because sometimes instruments like guitar, keys, etc, can clash with the vocals and it can be hard to tell them apart.
A: in the beginning you are gonna have to use brute force. just loop that moment. pick out as many notes as you can. see what that rhymes with / spells with. you will feel like you are coming up empty handed and confused on some things in the beginning, but after like 10 songs suddenly you will really start finding you are getting to know the neighborhood. then do a few more neighborhoods and by about the 50th neighborhood you will know your way around the whole city and then in a few years you will easily be a world traveler, maybe get a job as a flight attendant