the only real way of hacking is getting the private key. you should not be worried if you hold your btc on a paper wallet.
it is very close to impossible to retrieve it by chance.
all web, desktop and mobile wallets carry some risks and can be targets of hackers in many ways.

what are you talking about is just a 1 in a million chance, The best I would recommend is either you remember the password or just use a Two Factors Authentication wallet which is one of the safest one.

If your wallet or BTC gets hacked, chances of getting back your coins is extremely low. Precaution is better than cure. You better take steps to protect your fund rather then suffering later. Use hardware wallets to store your coins. Never reveal any kind of sensitive information about your wallet to anyone.

A key step to protect your Bitcoin is to store it in a hardware wallet,it is a physical  device,like the USD drive that stores your private keys and currency locally,and is not  connected to the internet.

I'd suggest to get desktop wallet as you have more controls of your private key, just make sure your PC are clean from malware and junks.

If you're really serious about security you can get hardware based wallet like Trezor or paper wallet, that should be enough.

It will happen to anyone if they are not really careful we all know that it is not easy to breakthrough the security of your wallet, the easy is to manipulate you or you are just giving your private wallet to the hacker, like phishing that is the basic one because mostly hackers are following you finding contacts and information to penetrate you thats why if you are weak and not finding it early then you can give your coins and bitcoins to the hacker

Yes of course you should be scared of hackers if you have a lot of BTC i do not think that hackers want to hack people who do not have a lot of btc why should i go after one if i can get more then one that is what hackers think and know.

If you want to surf into the internet without even caring of your security then you should have another type of device or computer to use because if you don't have an extra computer for some of the things that you want to do and if you will try to do all the things in only one computer then it will be very risky for you and it is not the best idea that you can depend on.

NO you shouldn't be scared of hackers if you have a lot of Bitcoin because if you know that your account is secured and you are the only one you know it there's no chance to hack it but if your bitcoin or your wallet get hacked just report it so that both of you will suffer your account can be banned and he/she can't use it.

Well, what I say my opinion is the best and most comfortable way to secure your bitcoin is using a hardware wallet. There are some that quite popular once like Trezor or Ledger Nano S. If you can have a lot of bitcoin, you should not  have a money trouble for buying this kind of wallet. You should not focus for searching the answer for your last question, as none you can do if that happens. The best way is prevention is always better than seeking for solution after it have happened.