Recently, someone in an ASD Facebook group wondered what we thought about self-diagnosis. They wondered how much importance we placed on adults getting properly diagnosed by a professional. The post proved to be contentious, in a good way, with informed arguments originating from all sides of the debate.
I can only speak for myself, of course. I believe it has to start with self-diagnosis. Based on research, reflection and online surveys, I was certain I was autistic. For me, proper diagnosis was crucial. I’m very science minded and needed all the facts. I had to know for sure. In fact, I was advised not to seek accommodations at work, until I had my diagnosis, and I believe my diagnosis will help if I ever require special benefits in the future. However, I do understand the cost limitations some self-diagnosed autistics face. I was very fortunate that my diagnosis was covered by the NHS; took me a year to see a psychologist, but it was well worth it.
While waiting, I did become anxious and sent a long, detailed application to the renowned Lorna Wing Centre. I was accepted for diagnosis, but the cost – over £2000! – was prohibitive; I chose to be patient and wait for the NHS.

“The Lorna Wing Centres for Autism are internationally recognised for their pioneering work in the diagnosis of autism and related conditions.”
Feel free to explore these links. Hopefully, they’ll help you answer the question yourself.