I think nostr gave you the background knowledge you'll need to use the Cold Card. Just take your time.

Roll 99 dice rolls.

 Test you seed phraze by sending a small amount first. 

Then Erase your seed. 

Restore it. If you screw it up, you're out 100k sats, but if it works, you'll know your seed words are valid.

Keep them secret.

Keep them safe.

Back them up with military grade stainless steel. You might make an extra copy.

You're about to embark on a journey into a journey  of cybersecurity.

Have fun.