One thing which cannot be punctuated enough is that all these libraries are already pre-mixed to sound as good as they can when played standalone. When you start to mix your project where all these sample libraries are used, no matter the genre, you should be able to sound pretty good already out of the box without much EQ'ing. Don't do stuff just for the sake of it. I remember when I started to fiddle around seriously with sample libraries, I overEQ'd and tweaked the living shit out of them, only to realize later that they need a fraction of all that corrective stuff. Don't be like me! Also, what I've also noticed during my learning is that the better the orchestration, the less you actually need (corrective) mixing.