To be successful, how precise do you need to be?
When you are building a house, should all of the wood be cut to within an inch, 1/10 of an inch, 1/100th of an inch or even 1/1000th of an inch? At what point do you begin to make your project take longer than its worth by being to precise?
Many businesspeople I have worked with in the past have fallen on the side of being too precise about small things while missing the big picture. They spend $100,000 optimizing their SQL database to be perfectly efficient, when it only costs $2,000 to buy a new server to make their code run just as quickly.
Are you focusing on precision to the detriment of your business goals?