Thanks. Interesting question. I don´t have a complete answer to that but spontaneously I have to like my T and trust her and if she presents things she has done or opinions she has that goes against mine, I lose respect of her. If self-disclosure is to be helpful it has to be about stuff the client can accept, not things that are far from the clients values. As an example that is.

By that I don´t mean I expect my T and I having the same values and opinions in everything but then it´s better for her not to self-disclose I think. It´s better not knowing like she had a lot of boyfriends when she was young (if she had, she hasn´t told me) as I look upon relationships in a different way and sees a person with a lot of short and unserious relationships as feeble-minded and childish. Two of the character traits I dislike the most in other people.