Thanks EleanorZ and others for the advice on the Mac wallet. I have my funds 'safely' stored off Bittrex.
I was surprised to see that
only the private key is needed to access a wallet. I obviously hadn't done enough research (currently reading a book on Ethereum Blockchains) as I had originally thought that the Wallet Address and Private Key formed a Pair together and that you must know both to access funds. After using the Mac Wallet, all I had to enter was the private key and it tells you it's associated address and balance, with the availability to send.
Without going too much off the topic of Neo, how does everyone else feel that your Neo is just a lucky computer guess away from being accessed? Even if the odds are extremely remote.
I would love to be told that my understanding is incorrect here
