The whole listening part is the most important thing whether you are in the studio, on stage, or trying to perfect an instrument or your voice. The more you actively listen to parts and isolate issues, the more you grow as well as the sound you want to achieve will happen. There’s really no guesswork when working in the studio.
Speaking of active listening and voices, if you listen to the voices with no other instruments playing, you could isolate a lot of problems and issues. Same with isolating other instruments with the solo button, it’s one of the most helpful buttons when I work in the studio.
Using headphones to really hear the stereo spectrum is another useful tool.
Not to speak of listening to as quiet volumes as possible in order to avoid ear fatigue. If that happens you can’t hear small details and you might as well stop and take a 30-60 minute rest.
To train yourself to good listening skills, listen at low volumes. Listen to all kinds of music and analyze what’s going on. Listen a lot!