Rarely is there the time, energy, motivation, or resources to make the right decision. Rarely is there a right decision to be made. Even if there is a right decision its legitimacy tends to be bound very narrowly by environment and temporality.
Instead, you should strive for a good decision. A good decision perfectly balances the cost of exploration with the benefits of exploitation. A good decision is resilient to incomplete knowledge and an ever changing decision space. A good decision sacrifices perfection for reliability.
A good decision will take you far.