Greetings fellow bitcoiners. I am no Pro in the world of Bitcoin for sure.But I have learned enough to open a new wallet with Blockchain.info and am about to fund it with about 0.5 BTC through bank deposit.I am still unsure about the mechanics of bitcoin payments.I am also confused about what others have told me ,that the full amount in the wallet will be used, like say I have 0.5 BTC in my wallet and the vendor charges 19.8mBTC for their product,will the entire sum of my wallet be used or is there a possibility that I can get the remainder balance/change into my wallet after deducting the vendor/miner fees?And btw can mBTC be deducted from Bitcoin? Terribly sorry for my ignorance.