For me a therapist self-disclosing does not necessarily correlate with trust. My therapist discloses very little about himself but even the things that he has disclosed I wonder if they're true or not.

Trust for me is derived more from the way he response and treats me. If he is accepting of the things I tell him and shows that to me through his words and actions then I feel safe too share more things. Sometimes I have felt judgement from him and this impacts my ability to share more specially things that involve shame. Unless my therapist is going to self-disclose some very shameful things from his past I doubt anything he tells me about his life is going to make it any easier for me to talk about my issues.

I do usually feel though that my therapist does give of himself he doesn't need to be vulnerable but I feel his giving of himself when he expresses unconditional empathy. I guess what makes these times more important to me is the fact that sometimes he does show a human side and I feel his frustration and non-acceptance of me. I'm sure this is not his intention but it's what I feel from what he's giving out. That's okay though because those instances are rare and it makes the times he is showing understanding of my pain that much more valuable and real to me.