I suggest the combo CM 16 RE (to preview edits) + RDBM or DBM to edit Squads or main database.
This way you can edit very easily, because you can easily search for all the ids you need.
As example you can now easy edit generic players via RDBM but using as preview the new CM 16 RE or FIFA 19 DB Reader I've released, check my thread for more examples.
If you can understand what I say, you will have fun editing Fifa 19.
has to import a career squad player to a new save for example in my career does not have the player ben Arfa and made a new career save in which he is in Rennes so I exported it to a folder, I can import to save in which he is not