Finally, do your best to avoid situations where a "quick decision" is needed; this is good advice even for "quick thinkers". Fast decisions are often poor ones - the counterpoint to that is dragging something out over many weeks or across many meetings - but putting yourself in a situation where the unknowns become knowns or the scope of the landscape and weight of the decision can be properly assessed is important. What's better is that you will likely be able to have a better paper trail for this.
If you have to make a 'quick decision', one of the pieces of advice I've heard is to try to make the smallest possible good decision that will move the ball forward. Often getting started is enough to provide more information needed to make a better long term decision, but making the best possible, smallest decision will rarely get you into trouble.