The easy answer is that you know you are capable if you own a computer and you sign up because this business is that user friendly. However, there is a moment when you know that you are on the right track, and that moment is different for everybody. For me, the moment I started turning a profit showed me that I am finally succeeding at SFI. It was not a large profit, but I earned more money than I spent for the month and I continue to make a profit every month!