Use currency exchange board. Always try to deal with people who have good feedback. Don't forget to check their feedback. Better you go with escrow if you are having a big exchange. Don't trust any newbie, of course.
I don't know if netteler can be charged back, if possible, make sure you are dealing with someone who have trading records of netteler.
Be aware of impersonator if you are going to communicate in other channel/medium.