The first step is admitting that it is there and still has a deep affect on you.
I am really serious here, so many people i have worked with have no idea that their child within is controlling their life. No one knows, so they do not know that needs to be healed.
One really weird thing is, if you go in with your inner-child, and change some of your past so that your inner-child had a good upbringing, many people will remember your new past.