The decisions we face in life vary in size, importance, and impact. Large decisions of great importance and impact like marriage, having children, career choices etc., require a longer preamble than say deciding whether to go for a run or what to have for dinner. That being said, however, when the time comes to act there should be no hesitation.
Unfortunately, even after doing the requisite due diligence, many people hesitate. Accomplishment requires physical action. Hesitation triggers the brain to seek alternatives and more often than not those alternatives do not encourage the required action.