I've been there with the whole trial-and-error of starting a business. When I launched my little online shop, I thought I was fully prepared with all the research and theory I had done. But, honestly, nothing beats real-world experience.
This is why it is good if you don't have good knowledge of handling a particular business it's best you employ or get someone who is capable of managing the business. With time you will learn the process gradually and become good in the business. That is when you many now decide to keep the manager and run the business alone. These days it's difficult to save Capital to start a business and if you manage to have one you will take so much precaution so that you won't loss in the business or run the business down.