Best way it has to be using a local exchange that is limited to your country only, instead of those that are available for many countries since with it's user limit, there's some benefits for those eligible users as well. I use a local exchange in my country that the more I exchange, the more bonus I receive that I could use one's I decide to alternate the process and buy coins other way around. If there's non from where your residing, then your best bet would be localbitcoins as mentioned by few others above me.
Yes this is the best way to exchange our bitcoin. But in my local exchange there is bit high margin but i don't have other source to exchange my bitcoin. In other way means search more green trust members in bitcoin organization and exchange with them they also take some margin but it's safe i did some times they will take our bitcoin and send money to our bank account like paypal or other accounts.