I think there is a big misunderstanding concerning the word, "risk", in business. People hear the word associated with business and believe it to mean to just jump in and see what happens. But that is not the meaning.
In economic models, after a thorough business plan is completed, the risk is not, "Will it work?". The risk is a calculation of return on investment. After a business is established, risk can be calculated in relation to expansion or a greater capital investment.
Of course, a business plan can fail. It can either be incorrect or an unanticipated economic condition arises. Or the owner underestimated the need or desire for the business in the market. It could also be a quality issue.
So the try it and see what happens idea is why so many businesses fail (85% in the first year, higher for the food industry). It's not about following your dream. It's about education, gaining experience, becoming an expert in your field, saving money for the project, writing a business plan with real numbers, and finally realizing your dream.