In addition, today anyone can buy a fully functional hardware wallet for less than $100, or turn an old computer into cold storage practically for free.
We have just had Black Friday week where it was possible to purchase a Trezor One for under 50 if you live in non-EU countries, Asia, and North American or for 55 to 57 in the EU. Even if it's the oldest hardware wallet with certain disadvantages, it's still a good and useful product even today. Set it up with one or multiple hidden wallets with secure passphrases, adhere to good security standards, and use common sense and you will be all set to be your own bank.