One.
I was a teenager when I went to therapy for the first time. I've seen some T's who waren't good or waren't good for me. I didn't know you could choose your T, that you didn't had to stay with the T they sent you to (everytime I quit/''finished'' a T/therapy, I got refered to another one). I thought it was my fault that I wasn't making progress. That I was a failure.
Around when I was 21 I quit another therapy, it wasn't working and they sent me to group therapy and I know that wouldn't work for me.
I started looking online for therapy. I didn't chose that the T, I chose a practise and that T was the first one that had an opening. Luckily it worked out fine.
I now have a new T (replacement t). She works at the same practise as my T and my T chose her for me. I like her and she's good, which I actually didn't expected. But if I hadn't liked her, I wouldn't have stayed with her.

So I've never really went T shopping. I wished someone had told me as a teenager that you didn't had to stay with the first T you got. And that it wasn't neccessarily my ''fault'' that I wasn't making progress, but that it could have been that the T wasn't good.
The only one who has ever told me that was my former pdoc. But by that time I already knew it.