I think that depends. When I first started with a password manager, I came from “paper & pencil” - and just entered everything by hand, one by one.
(for those who may read it also: I found, logging in to my services and changing the password at the same time as I entered it into Bitwarden, was quicker as first entering everything and after that go through everything again and changing all passwords…)
I guess no duplicate tool can help you with that now…
So, good luck then!
PS: If you don’t create new chaos afterwards, the good thing is, the duplication tool is probably never needed again when everything is set up…