Plan the unplanned
Most people have a plan. Some have it at the back of their mind, other write it on paper. Some just have the big picture, the others have all those nitty gritty details. The more detailed your plan is going to be the higher chances are things won’t work out as initially expected. It totally worth your time to visualize and plan out how things are going to be but never miss what if it doesn’t? Things will break. Expectations won’t be met. People including you would change their mind and back off. It would take forever to make your first sale. People will pull you down. Deadline won’t be met. Formulas will change and what not. All part of the plan that includes the fact that plans almost never come true.