Not many in my case as the top was already peeling and came up pretty quickly/easily. There didn’t appear to be any friable material, so I didn’t worry too much. One desk didn’t have anything on it at all. You can do it outside with mask and gloves and take care in disposal. I suspect it will depend on the manufacturing date and materials to know if their old process included any asbestos in the first place. Your mileage may vary as a result. If worried, have a professional do it.