Perhaps download and have a read of this:
Nikon D800 technical Guide [PDF, 2MB)
It was designed for people upgrading from lower megapixel cameras like the 12MP D700 to the 36 MP D800, and who were encountering some of the issues you have raised.
"While its groundbreaking 36 megapixels give the D800/D800E resolution unrivalled by previous digital SLR cameras,
a side
effect of such high resolution is that blur, whether the result of imprecise focus or camera shake, becomes that much more noticeable. Realizing the full potential of a camera with over 30-million pixels involves a thorough understanding of the
causes and characteristics of blur, careful selection of settings and tools (lenses, tripods, etc.), and working with the best
possible subjects."
The technical guide talks Nikon, but the techniques and technology apply to the K-3 too.