It's totally stressful being misdiagnosed, and I was worried that would happen during my eval too. My evaluation was split into 3 two hour sessions. I specifically went to a center that specialized in autism. They sent me 2 tests in the mail. One was a self diagnostic tool, the other was the same diagnostic tool but to be filled out by someone close to me. I sent those in before my appointment. I was evaluated by 2 different people, one-on-one each time. I can't remember much of the tests done since my memory is crap for this, but what I do remember is that I was asked questions about my behaviors during childhood, what others have observed, how friendships have formed for me over the years, how social interactions tend to go. I was asked to read a picture book and identify emotions of the characters in the book. Then I was given something to doodle/write with while the evaluator had a conversation with me. I also remember being given a set of items to make something with. My final appointment was to meet in person for the diagnoses, but because this was scheduled during the very beginning of the pandemic, we'd done it over the phone. Hope this helps!