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TordlWalletProtocols
This repository documents various methods for securely backing up and storing bitcoins.
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You can't just use any words from a book. You have to use words from the BIP-39 wordlist.
Sounds like you're realizing you want to have self-custody over your coins. I'd recommend you take a look at The Tordl Wallet Protocols which are guides on how to properly store your bitcoins. This includes guides on both single-signature ("normal") wallets and multisig wallets, as well as info about inheritance and other things important to the security and usage of your coins.