If you decide to use Localbitcoins, maybe this will help:
https://localbitcoins.com/forums/#!/general-discussion#what-prevents-me-from-getti
(link works, just copy/paste it)

http://www.deepdotweb.com/jolly-rogers-security-guide-for-beginners/localbitcoins-part-2-thieves-scammers-and-counterfeit-bills/