A lot of mastering engineers are afraid to make drastic changes to a mix they are working on. That, or they're stuck in the familiarity of always making only small changes.
In this video I show how you can turn a weak mix (definitely wouldn't call it bad) into a great sounding master, simply by pushing your levels a little more than you might be used to.
Don't spend 1-2 years (please never), 6 months, or even 6 weeks learning how to professionally master audio. Not to mention waste a ton of money too. Not when I can show you EVERYTHING you need to know in ONLY TWO HOURS with my Audio Mastering Secrets Video Series!