What can a psychologist tell you, that you cannot work out for yourself?

Lately I have been having a lot of revelations, about my life, now in the present and the past. Including how the past has impacted on my life now. The types of patterns I have had. Astonishingly also answering questions on Fluther has lead to much introspection and realizations. When I answer a question it says a lot to me, about me.

I don’t want to be too analytical here, because yes changes in cognition, or in-depth psychoanalysis, or others, offers different slants into the psyche of a person and therefore hopefully change if necessary. But really couldn’t we manage this on our own? Or most of us?