Not many people know the importance of training your ears to recognize different frequencies within a mix or a song that you are in the process of mixing.  Most people take the approach of just opening up a EQ and guessing where they need to raise or lower a few dB in order to get the results they are looking for.  I used to be in that same boat until I learned about ear training software and Cd's.  The beauty of these Cd's and programs is they train you to recognize a frequency in a mix, and thus making the mixing process faster and more efficient.  I have found a nice link that has many different programs you can follow in order to train your ears the proper way.  It takes a little while to get it down, but once you understand the tone each frequency makes and how to recognize it in the mix, you will realize how worth wile these programs are and how you can use them in the future.  Here is the link : http://www.hitsquad.com/smm/cat/EAR_TRAINING/ There are free and pay programs, find the one that works best for you and do it.  You have nothing to lose! - Cheebs