I've only been playing for about 8 months now, but I am pretty ambitious and have high goals set for myself in terms of my bass-playing. Anyway, I've been trying to move away from tabs lately, but I am having a horrible time learning to play much of anything by ear. Even simple songs (for instance, I was just working on Mission by Rush, which is overall a quite simple bass line) I have trouble with. How should I go about training myself to be able to learn by ear? I know its a crucial step for me in my general playing as well, especially in terms of translating a sound I have in my head to a sound from my bass, without fiddling around trying to get it right.