Got an overpayment notice, what now? (update)

I received a letter saying I was overpaid about $950 on my claim. I worked as an electrician's helper before this. The letter mentions an appeal window and a repayment plan. Has anyone disputed one of these?

Read the letter for the appeal deadline and act on it, even if you think you will end up repaying. Then ask about a payment plan.

I asked for a waiver and a plan in the same call, and they gave me both forms. It was less scary than I expected.