If you're in the US and trade for cash at meaningful volumes or as a business, be very careful. Law enforcement agents have infiltrated P2P trading platforms. They have arrested many people at this point for unlicensed money transmission just for trading on Localbitcoins. The IRS has been involved in some of the larger cases too.

Better to do it through multiple venues (not just Localbitcoins) and in lower amounts not approaching the $10,000 CTR threshold to stay off their radar.