Talking. Lots and lots of talking.
Mostly about how I am and why I am that way. I mean, there are several reasons for routines, bad social ability and so on and not just AS.
And a few tests. Questionnaires, mood checks, AS-test.
I assume that most people don't go to professionals and actually know what's the matter with them. It makes a huge difference to be very aware of your traits and symptoms and what a disorder actually means (from a lay-person's perspective).
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett