Will I have to talk at my hearing?

Yes. The Judge will want to hear from you how your impairments affect you personally. They have the medical evidence and any diagnosis that was made on your impairments, but they need to hear from you about limitations and symptoms you have and how that might affect your ability to work. Your attorney can make any legal arguments necessary, but you know your limitations and symptoms better than anybody else, so the Judge will expect to hear from you about those things.