From my observations of successful people, one of the most common characteristics I see is the ability for them to make quick judgement calls that end up being right more often than not. While good judgement does not necessarily make one successful (causation, correlation, blah, blah, blah) it is my opinion that you can put yourself in a position to be more successful by improving your judgement.
How does one go about improving their judgment? Easy. Practice. Seek out opportunities to make as many decisions as possible.