I think if you use good wallet and strong security, your Bitcoin will be safe.
Whatever strong security you have , they are professional they still can do it, the better way double or even triple protection by your mobile, email and by taking backup.
More or less that is possible. I think the better way to do is you have to transfer it into your currency so that whatever may happen it has already a value and you can spend on. Don't wait too much for the growth if you think it's enough then transfer it to your wallet and make use of it before discrepancies may occur. The earlier the better.
Yeah hackers are very smart and well trained, but if you choose the right and safe wallet, at least it can reduce the risk of your bitcoin stolen by hackers. You can use additional security like 2fa (sms verify, google auth, etc) with it then you can minimize the possibility of hacked, and based on my experience I have never experienced hacked my wallet