When it comes to mastering knowing is never too much, because doing with just a little knowledge can lead to bad habits eventually leading to disaster.
Such practices result in bad quality and the musicality of recordings in general over the last few years. Especially today with all the tools available out there knowing just a little can take further away from your dream.
Mixing is not equal to mastering, now this may involve processes that one has to learn and must go thru to come up with great results. Mastering is a different stage apart from mixing although they work hand in hand they are different.