Read the sellers feedback to get an idea of what kinda person you could be dealing with. Check for complaints and how other orders went. Always try and stick with paypal if you can. Look for little things making sure they have said the item is brand new or they know for sure it works. One little thing you miss could lead into just blowing your money on something that doesn't work if you don't look into it enough or ask the seller questions. Its the internet, just be aware of everything your doing.