I have not started on these specific minis, but I have cleaned up the SDE minis. I used an Exacto knife with a new blade and a carbide scraper and got decent results.
My suggestion is to angle the exacto blade so the sharp side is pointed away from you and the top dull end is torwards you a bit. then pull the blade towards you. for small mould lines this will be enough to scrape it off and you wont cut into the mini
I mostly used a scraper. Occasionally switching to a knife for harder to reach places.
The scraper worked well on these plastics. It's pretty much what they exist for eh. Takes the mold lines away cleanly, doesn't gouge into the plastic as a dodgy angle with a knife could do, and doesn't result in lots of waste tendrils that stubbornly refuse to leave the mini the way a file could suffer.