When you have to make a decision, committing to “think hard” about it first is usually just an excuse to spend longer ultimately justifying your emotional impulse. Yes, it’s better to take some time rather than just fire off a response to an important decision, but unless you’re spending that time in a truly data-driven process, it’s only a little better.
Try this: Right now, without any major decisions looming, decide on a process for making important decisions. Maybe you’ll assemble a council of intelligent, trusted advisors and commit to following their majority input. Maybe you’ll commit to making a list of pros & dealbreakers before settling on the final answer. Or any number of good decision-making techniques might work for you, but the point is to commit to that process now, before you have any specific decision that you’re trying to make. The more you commit now, the more likely it is that you can overcome your emotional rationalization when the time comes.
The Opportunity Machine 