The biggest hurdle is rejection. Any business you start, be ready for it. The difference between successful people and unsuccessful people is the successful people do all the things the unsuccessful people don't want to do. When 10 doors are slammed in your face, go to door number 11 enthusiastically, with a smile on your face.
Humility is the true key to success. Successful people lose their way at times. They often embrace and overindulge from the fruits of success. Humility halts this arrogance and self-indulging trap. Humble people share the credit and wealth, remaining focused and hungry to continue the journey of success.
Successful people maintain a positive focus in life no matter what is going on around them. They stay focused on their past successes rather than their past failures, and on the next action steps they need to take to get them closer to the fulfillment of their goals rather than all the other distractions that life presents to them.