With the streamlined process, I will be required to attend only one resale appointment at HDB. How is HDB going to explain the details of the sale proceeds calculation to me?

The sale proceeds is calculated based on the resale price less the financial obligations you need to discharge, such as the outstanding home loan, CPF refund, etc. Details will be posted on the HDB Resale Portal. You will need to log into the HDB Resale Portal to endorse the sale proceeds calculation, as well as other resale documents.