Being in therapy is good, yes. A therapist can do this with you if your willing to heal. Its not really about that the person will do much except provide some feedback, it is more about you exposing your trauma, forcing yourself to remember parts that are lost, rereading what you write until you are no longer scared off it, then you will certainly improve yourself enough to atleast have the majority of your trauma subside, so you can get on with tackling all the smaller issues of PTSD. Yes, you will fall if especially if you haven't ever discussed all of your trauma before.