It very simple if you wish to sale your bitcoin or ethereum you can do that on exchanges that accept bitcoin for faint and that support your local currency, their are so many exchange around such as remitano and luno if you use an android device you can download the application from your play store and register to get started. Good luck.
OP said that bitcoin is banned in his/her country; so there's a decent chance that these exchange sites are banned on an ISP level; and if not, it still isn't worth the risk as OP would probably have to pay some money or some jail time if he/she get's caught.
Yes,why not.At present bitcoin price is low.If you sell bitcoin then you can not get enough price but if you keep your bitcoin then next time you get more price.If you much need to sell bitcoin,then you can.
If you need to sell the BTC. Use the local bitcoin but transaction fee in the local bitcoin. So safely use the bitcoin. If don't. Know how to use the local bitcoin. Find you trusted person then exchange it. But before buy and sell check the market price. So time is important of this process. So follow the market price day by day. Then get some ideas.
Both of you, do me a favor and actually read the topic carefully before making a reply.