I googled my therapist fairly extensively, no tax records, but found a property record without too much trouble so I saw her home on Google Maps and found her address, property value, ex-spouse's name and her phone number, along with past career details, associations, facebook, etc.

I disclosed my findings in general to her, such as that I had her address and such. She was not taken aback by anything except me having her address. That one gave her pause: after thinking about it a moment, she said she trusted me and wasn't worried, but that knowing so much was online was new to her.

I occasionally look her up, mostly to see a photo since we don't meet in person, or read her blog: she volunteered her blog for me once she knew I found her comforting.

So... it went well, I'd say. A bit rocky for a bit but well. That was many months ago. It hasn't been an issue since or had any noticeable negative impact on our therapy.