But don't get discouraged. There is a common meme that startups need to work 'til they puke to "make it" (check out this site: http://blastingstation.com). Plenty of startups were successful by working hard, staying focused, and persisting.
Remember, as a startup founder, your only job is to find and motivate great talent; set a clear vision; and make sure you don't run out of money / time. Stay focused, set milestones, and persist.
Also, you should check out StartupPlays.com <- it's an online accelerator with modules to help you grow your startup by some of the same mentors in the YC program.