I am totally self taught, both at business and at photography, but starting my own business was not a simple matter. I built it only after studying philosophy and ethics at University, then working in, or managing, sales, customer service, logistics, supply chain, operations and cost accounting at different levels in several very different businesses.
Currently I have access to advice and mentoring from a business partner and my father, as well as friends in the industry who also run their own business and access to a professional organisation, and of course I have a good accountant.
The result is a set of skills and experience I can apply to the business, and looking at actual vs budgeted sales it appears to be working very well.
I do know a number of photographers and other creatives who studied for degrees in fine art etc, only a small number are successful, and most of those only because they know people in the industry and get support from them, or their agency.
As generalization they are also very inefficient in how they work, meaning they don't fully realize their maximum potential revenue and often incur unnecessary costs.
I consider them easy competition as they maybe better photographers, but have a total lack of understanding of business.
The few who are very successful also have plenty of business knowledge and experience, or a natural talent for it.
They make a difficult combination to compete with in the market, as they excel at both photography and business.