It’s not too hard to do it right.
  1. Use a hardware wallet and choose a hard long PIN for it.
  2. Save your seed in a steel backup device.
  3. Save your seed phrase in multiple safe locations.
  4. Use a passphrase on top of your seed words that only you know and that is never written down.
  5. When you travel internationally, wipe your hardware wallet and recover it after arriving. Bring your steel seed backup and a paper backup. If anyone takes your backup, you are still protected by the passphrase. You can simply move everything to a new wallet when you get a chance.
Traveling internationally with a significant amount of bitcoin is definitely scary. Actually, I should rephrase that: crossing international borders is scary. If you don't have to bring key material, don't.
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