The hardest parts are getting those customers and keeping them. When you are high functioning like me you can do almost anything in IT, but lack people and social skills. People and social skills are needed to market and use public relations to get those customers and you have to emotionally connect to them. You have to keep them satisfied or else they leave and go somewhere else. You have to let them know what needs your products and services meet, you have to find ways your product and services save them money and time. This is why 9 out of 10 startups fail, can't connect to people enough to get them as customers.