Few users have quoted localbitcoins.com to be worthy on using it anonymous. I too suggest the same because this trading website provides lots of additional features which can't be got with other exchange or trading websites. One among the best is buying anonymously without revealing identity. This is possible only with limited traders available in localbitcoins.com.
Localbitcoins is a good way to sell it anonymously, but only if you have to. Because it sure is an hassle.
Another good way is to use an bitcoin creditcard, you can use most of the cards here on the forum and stay anonymous.
To be clear, selling in-person is not really anonymous. You of course need to physically meet this person (which could lead back to you).
If, for instance, you sold someone tainted coins from the Bitfinex hack: once that person spends those coins with a 3rd party, the FBI might be knocking on his door asking for every detail about you. Better be careful to cover your IP address securely when using LBC also in that case!