9 entrepreneurs who left corporate America share the biggest challenges of running a business — and what to expect before quitting to work for yourself

• Running your own business comes with a unique set of challenges.
• Insider spoke with entrepreneurs about what they wish they'd known before leaving their 9-to-5s.
• One major challenge is finding good, affordable health insurance. 
• This article is part of "Starting Up Your Small Business," a series exploring steps small-business owners can take when starting out, transitioning, or scaling up.

Starting a business isn't for the faint of heart. It can be a risky, stressful, and all-consuming career path.