I'm struggling with something similar, as I see a new potential T in 45 minutes (then maybe another on Monday). I'm afraid of scaring him off with certain questions. Like, "How do you handle it if a client becomes very attached to you?" Or "Are you willing to say 'I care about you' to clients without a bunch of conditions on it?" And there are others that, like in Susannah's comment, I doubt they'd answer honestly. Even if they answer everything perfectly, doesn't ensure a good fit. I tend to just go with what I feel from someone, like what vibe am I getting from them, do I feel comfortable talking, etc. Well, maybe anxious the first session, but, just...how do I feel about it? Do I feel I want to come back and see them again?