Chris Sharma is a great climber, arguably the best in fact. In this interview he talks about the proper mindset for taking on difficult climbs. Even though the problems that he goes up against are so much tougher than anything us as mere mortals could ever hope to take on, his mindset and approach is a great way to think about attacking routes, regardless of your individual skill level.
Also there are some great shots of him climbing and (*gasp) even falling off of routes. Enjoy!