Tapping is a good help, and I have read that you cannot do it wrong. Of course, a session or two with a trained pro is always good, but two psychotherapists have told me that you can learn it from youtube or reading, and there is no "wrong" way. Listen to your body.
EMDR is a great help also, but for that you must have a trained pro as there is a lot involved in the choreography.
Yes, I get the most out of tapping from my sessions with my therapist because she guides me and we go in depth to things that have been stuck within me for years. But once you start tapping, the energy gets moving and if it's moving, then it can transform.