I used counselling directory. Filter by the kind of counselling you want or the issue you want to work on. Filter again by the ones you can get to and the ones you can afford. If you have a preference for sex, age, orientation or w/e you can filter by that too.
What results remain are your options. I skimmed photos after that and make a shortlist of 5 that I liked the look of. Phoned them up and arranged a first session to meet them and see how they work.
I only actually met one as he was the only one to return my call. I liked him so I went back and here we are 2 years later.
See how you feel with them. It's not going to be comfortable as such but you want someone you feel safe with and can connect with. It depends what you're working on I guess.
For me there's a lot of talk about suicide and childhood sexual abuse so I needed someone who wouldn't be too quick to overreact but would be solid and unwavering in their support. A lot of the work takes place within our relationship so someone who is of that modality was essential.
A therapist who is more of a blank slate, a psychoanalytic therapist would have done me more harm than good.
He has good firm boundaries but isn't a completely closed book. I can ask him anything. He might not always answer but I can ask. Most trivial things he'll answer if I actually want to know. He won't let me redirect the conversation to him (usually to deflect something I don't want to talk about) but if I ask him a direct question, he'll generally answer it.
Some therapists won't though, they will refuse to give away anything about themselves, even pleasantries like how are you? I have issues around attachment and this kind of therapy wouldn't work for me. It's worth researching different modalities of therapy and how they work so you know what to expect.