1st thing you can use and mm if you dont feel safe or if the user you are trading with is farely new to the site.
2nd thing you can do is always ask for a pm confirmation from the user on discord; the real one will never deny it.
3rd thing you can do is to always make sure the buyer goes first and if they are sending via paypal Friends & Family through balance and with BTC make sure the payment hits 1 confirm then release goods.