I am curious about how others approach this. I tend to dive right in and decide whether or not I like how the T responds. They will almost certainly maintain confidentiality.
EDIT - but usually it isn't about what I will be revealing this time; I dove in with details on relationship or depression but held back if the discussion ever went into my past drug use or juvenile delinquency (stuff that would have led to arrest and/or psych hospital if I were caught)

I see a new T tomorrow and one of the reasons is substance use. What I quit this time is pretty tame compared to what's in my past that I still have urges for. I want to go after root causes. If I had a little less will power or luck, I would be in a gutter somewhere. I'm actually quite successful career wise and in the past I hid how deeply troubled I am. I fear that if I start slow about revealing things, I might revert to that. I went wide open with a new pdoc and I think I am getting better treatment.

So what do you do?

EDIT - typo in poll - that should be "Cautious and slow about revealing my secrets"