Is there a step by step tutorial of the process you mentioned?
Yes... I have written it up several times before... this post is probably the tidiest version of it:
https://bitcointalk.org/index.php?topic=4746784.msg43255691#msg43255691NOTES:
when you are importing the "Plain Base58" (aka WIF) keys into Electrum you may need to specify the "script-type" to get it to show the correct address (as Electrum supports multiple address types):
If your Armory address starts with a "1" use the "p2pkh:" prefix
If your Armory address starts with a "3" use the "p2wpkh-p2sh:" prefix
A few examples (as per the Electrum "info" button):
p2pkh:KxZcY47uGp9a... -> 1DckmggQM...
p2wpkh-p2sh:KxZcY47uGp9a... -> 3NhNeZQXF...
Also, you will likely see several hundred private keys/addresses when doing the export... if you've only done one transaction, you can simply use the one key that matches the address you sent BTC to, you don't need to import the other hundred keys