Perhaps you already have this experience, but you might try some not-so-technical scrambles with knowledgable friends to get some experience living above treeline, dealing with weather, cold, snow, exposure, etc.
Being comfortable in that environment to begin with can make a difference on whether you make it to the top of something or not. It just takes time to develop the discipline to take care of the little things, and it's the little things that add up to become big advantages or big liabilities during a climb! No book will teach you this stuff.