Be reminded that you your sell order can only be executed if there is a buy order of more or same value that you've input. Otherwise, it will just wait until someone buys that coin having the particular amount where you'd sell it; it will be listed on sell book of the pair. You can instantly sell it though if there's a buy order on the pair. But it does not mean that you can sell all of those coin in one time. If that coin has very low volume, it's quite safe to say that it will be not easy to sell.