Astral Projection, OBE's;?

I would like to know if anyone out there believes this is possible. If so, Please tell me about your experience and how you achieve this. I have been doing this for a very long time with little success. Be it tips/tricks or what you may do before hand to prep. I would really like to know how this has impacted your lives. The few times i have, each time, its truly life changing. Thanks