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For OBE info check
http://shopofenlightenment.com/forum/astral-projection-f13.html?sid=7be31500e887a66866d37d901a7bcfe4
You can visit different times in your probable past and influence changes there.
But, this is not your past exactly. The past and future exist, from our perspective, as probability clouds of possible variations.
Any influences you could make in the past would only initiate a new parallel timeline for your overall personal earth experience.
Imagine if you could get outside of time and experience all the possible timelines that came with your birth.
That is, ALL of the things in your life that "could have" happened.
As for inhabiting your past self and living again, both the past and future are happening now, already exploring the different possibilities.
This link
http://www.nirvikalpa.com/content.php?page=seth3 , might also be of interest