On average, millionaires invest 20 percent of their household income each year. - Ramit Sethi

To test for demand, just ask yourself, "Do a lot of people care about this?" If the answer is yes, then ask yourself, "Are people willing to pay a lot to solve this problem?" to figure out price. You'll quickly see where your different ideas fall on the chart.

If fear of failure is paralyzing you, then I strongly recommend you set a tiny, realistic goal for the day. When you achieve it, then move on to the next tiny, realistic goal. Your business is going to see better results from taking action on small goals then dreaming about unrealistic big goals that you never achieve.

One thing I've learned in the self-development business: We all have lots of reasons why we aren't doing something we "should," like investing, flossing, or starting a business. No time, no money, not sure where to start, etc. Sometimes the truth is simpler: We just don't want to.