Hmm… I'm new to all this; I've moved bitcoin I had in poloniex&bittrex to a bitcoin wallet, but I've still steem and few other small quantity of other coins kept there; so, you suggest to put coins on an exchange just for the time to make the exchange, and then move them away in wallets. Though, withdrawing has a fee, and if I want to exchange more in a near future, don't you think it's better to take the risk of leaving coins on the exchanges?