I find it much easier to write it first, then either give it to t,or read it while there.
Recently I've taken to tell t art the very end of session, then hope we return to it next session. It seems to take the pressure away (and it still takes me that long to build up the nerve to talk about it).
My t's have all been cool about it. They let me take it at my own pace, and are understanding/kind/supportive when I have talked about it.