It is already expected to face some challenges when venturing into any kind of business. These setbacks will always cost you money. However, you can minimize it as much as possible by using even the basic management theories.
One example would be the PLOC method: Planning, Leading, Organizing, Controlling. If Sarine considered this, she wouldn't have to find solution along the way. She can anticipate the possible problems and prepare solutions already for them. In this way, everything won't be subject to a trial-and-error process.