As far as private keys goes, I am thinking about using Trezor to securely store my bitcoin. As far as withdrawing goes, I will need to talk to my bank and get a lawyer as well. Eitherway, I need to find a way to purchase a house from the funds I have in my Coinbase Bitcoin wallet. If I can purchase a house with Bitcoin and not cash, it will be soo much easier for me so that I do not have to deal with the bank, other complications, and withdraw delays. If you guys have alternative suggestions to make huge purchase like a house or car with the funds in a bitcoin wallet, I will like to know and choose the simpler path.