I learned engineering from books, and later spent years reading and searching for a description of my family troubles. Everything in my bubble was about nurture for 15 years until I finally stumbled upon a description of AS. With that clue, I found a counselor who, unlike a book, could tell me how unusual some of my history was, make educated suggestions and tell me what search terms applied to things I could only describe with a sentence. It wasn't just validation. I've also had counselors who were stuck on the wrong track, and dangerous.I think it's worth noting that everything a good therapist can teach you can also be found in a book. There are self-help books for almost every condition and problem related to mental health, emotions, thinking, etc. Instead of shopping around trying to find a good therapist, you could just read a book written by a great therapist to get the best advice. I know some people have found these self-helps books to be more helpful than seeing a therapist. Of course, I realize reading books isn't for everyone and that having a great therapist who understands and validates how you feel (if you're able to find one) can provide additional benefits (such as social connection, feeling less alone) that you might not get from a book.