If you're inexperienced with cold storage set up, I would strongly dissuade you from pursuing such implementations. They are fairly confusing and complex for the average newbies and could result in unnecessary problems and headaches. In the case of Ledger, for which other than the database blunder, has been performing fairly well, it's a good HW wallet. If you're scared about the wallets being tampered, you should be scared about the bootloader/firmware of your phones being tampered as well. I wouldn't be surprised if there's some sort of intentionally inserted backdoor, though Apple has publicly refused but who knows? If you want a more open wallet, try using ColdCard.
I cannot recommend you to use phones as cold storage unless you know what you're doing. There is no way a phone could achieve the level of security that a hardware wallet can provide. If you have the money to spend and want to avoid headaches, go for hardware wallet.
If you still want to do this, consider using Electrum's method instead. It's quite a proven and tested method.
https://electrum.readthedocs.io/en/latest/coldstorage.html
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There are people that had problems with HW wallets. A few days ago a guy lost 386 eth and he is not the only one. The problem I see with HW wallets is that you have to connect it to pc which can't be airgapped. I know that you need to physically approve but he said that he's done everything properly and he is not the only one. Another guy tried to connect after 4-5 months to check his account but at that time there were problems with the ledger and he couldn't see the balance. After a while (couple of months from what I remember) he checked again to see the balances and seen that it was a transfer made exactly the day he checked the acount (few months before). If the phone its tampered it stays offline anyway so I think its better with a phone/pc because you never connect it, only use it for signing. On the other hand the ledger has to be connected, therefore there is always a chance for new malware to come in. Maybe today there are no malwares that exist to steal your money from the ledger but because you connect it every time you have the chance that someone creates a malware that is bypassing the ledger rules. Idk, as I said I really dont know coding but I kind of use my logic and it seems that ledger is not better than airgap device even if the device it's a phone.
About the part of being hard and giving me headaches I don't really care, I like to learn and trust me that if I lose the money there would be no higher headache than that
) . I love to get headaches that I can deal with than headaches than you can do nothing about. Thanks all for replies and taking your time to explain it to me.
Wish you all the best!