You don't have to talk to me for very long to learn that I'm in therapy, in no small part because I'm pretty guilty of sharing unprompted anecdotes that start with, "My therapist said..."
Now that I've graduated past being a total therapy newbie, I've realized that there are things I wish I'd known ahead of time. If I had, I probably wouldn't have put off going for so long, not to mention I might've gotten more out of therapy sooner.
So, I'm passing on a few findings from my experience so far in case it'll help. Just keep in mind that therapy is highly personal and not everything here will apply to every person.