Some of the challenges are practical. With no boss,it's easy to take too much time off-and get too little work done. With no co-workers,you might feel bored or lonely. You have to pay for tour own benefits, like vacations, insurance, and a retiremant plan. And if you make a bad business decision,you could lose all the money that you invested. For all of these reasons, more than half all new businesses fail within one year.