It is one thing to hear an expert talk about autism, it is another to hear a person with autism talk about autism. This is one of the reasons that people are drawn to Temple Grandin. She is able to give insight that is so helpful in having a sense of what autism is like.
A good place to start is Temple’s book, Emergence: Labelled Autism. While not a full autobiography, Temple shares in this book her experiences growing up with autism. What is helpful in this book is that she describes what she was doing on the outside and at the same time what she was feeling on the inside.
Another thing that I appreciate about the book is that it really represents her personality. If you have seen interviews with Temple, that is very much how she writes this book.
One word of caution. In general, it is not a good idea to apply knowledge of one person with autism on another person as everyone is different. This is especially true for Temple, as she is an exceptional person.
Having said that, I do recommend Emergence: Labelled Autistic.