Another thing to mention, you dont have to sell BTC in Coinbase, you can use their GDAX trading platform (which is connected to Coinbase) and put a market (limit) order for no fee.
OTHERWISE when you sell your BTC through Coinbase:
- the price is not in your favor
- the FEE is 1.5%
(ps. GDAX exchange is 6th by volume on CoinmarketCap, so it's not some shady exchange) :)
Oh nice!! I've never done it that way myself..but will do some digging. :)