Install and set up Square Cash app. It's literally as easy as Circle.com sign up, if not easier. You can do it from your phone.
https://square.com/cashFor the transaction, Buyer sends you *cash* via the app. After agreed upon time for receipt to Seller's bank, Seller can send bitcoin to the Buyer's address.
The snag part for people is how to pay for it unless you hand someone cash directly. To avoid dealing with actual hard cash, the Square Cash app does free bank to bank transfers that are usually done in a few minutes. Once it's cleared, they can't take it back without your authorization. This is better than paypal where they can pay you and then anywhere in the next 6 months file a claim and PP will pull the money regardless of your authorization and return it.
Once it's there, then you can send the bitcoin from one address to the other however you choose to go about it.
http://www.circle.comI think between Square and Circle - bitcoin's success is literally shaping up!