Is there a possibility to do a migration without using the GUI of Magento 2.
So one can automate the whole porocess on the day of migration?
With the current workflow of our migration tool, all configuration steps (Step 1 -- Step 8) need to be done via GUI of Magento 2. Once done, you can either run the migration via the GUI or CLI mode at your choice.
Please refer to our Readme manual for further info about the CLI mode.
Hope that helps.