I always found that it was best to start slow. Start with talking about the things that come easy. Also bear in mind that the therapist cannot help you if you censor yourself. You are doing more harm than good by doing so. Therapy isnt easy by any means and sometimes it can be intense as far as topics covered, but if you really want to get past some of the underlying issues you just gotta take the plunge. You will find that the more honest you are, the more comfortable you get with the therapist.