A secure location, such as a bank or police station lobby, is recommended. Customers from over countries can trade crypto to crypto. As long as you are selling at a reasonable price — like the market rate — the trade should happen relatively quickly. They act as a middle-man for the famously decentralized cryptocurrency by selling your Bitcoin for you. Of course, if the value goes down, you will have lost money. So Coinbase has marked up its prices somewhat. If you are directed to verify your ID, that is the next step covered.