One of the counterintuitive things that I've learned is that procrastination is often a side-effect of perfectionism -- but in cases where the "perfect" path isn't obvious. It's better to do nothing at all until the perfect path is understood.

Defeating this is a real challenge and requires serious conscious effort. People who have reputation as "doers" often gain it by finding the "good enough" target and driving towards it. Many "do nothings" are really people who have an overdeveloped desire to "do it right" and can't overcome it.

It's absolutely a matter of emotional control.