It's true that as your experience and skills evolve, you should occasionally push the envelope of your personal constraints. But to paraphrase Clint Eastwood in the film Magnum Force, you've got to know your limitations. And you do have limitations---which also means you can't always do everything just right. 

It's important to have high standards for your work; in fact, you need them if you expect to achieve consistent productivity. But be aware of the difference between high standards and impossibly high standards. When your standards for yourself and your team become so lofty they tick over into the unreasonable, they'll do nothing but slow you down---like an anchor tied around your neck. Ironically, maintaining absurdly high standards can as bad as having no standards at all. 

Of course, this isn't an excuse to slow down or slack off. Always strive for excellence. But at the same time, remember: true perfection is the province of the divine. If you try to consider every possible outcome and arrange for every contingency before making your first move, you may have trouble getting started at all. While some of us like to say we work best under pressure, that's rarely true. You're like the undergrad scrambling in the ninth hour, staying up all night to write a paper assigned half a semester before. Indeed, more often than not, the results reflect the amount of time spent on the task.

Rather than hold yourself to angelic standards, be a REALIST: