Buying and Selling Bitcoin

Buying Bitcoin is relatively safe if you are buying from those big exchange like Mtgox.   The smaller exchanges are also quite reliable.  If you are doing an exchange with an anonymous person, the danger lies with them because when they send out Bitcoins it is irreversible, but you can charge back your credit card or Paypal.   Of course you are facing the same dangers of chargebacks if you are selling Bitcoins.  For this it is 100% safer to go through the exchanges.