How do I request FBI file on myself?

I'm curious about how one might request a copy of their own FBI file. Could you elaborate on the steps involved in making such a request? Do I need to provide any specific documentation or identification? How long does it typically take for the FBI to process and provide access to these records? Are there any fees associated with the request? Additionally, is it possible to request specific sections or information from the file, or is the entire file provided? Any insights or advice you could offer on navigating this process would be greatly appreciated.