I had to look up what an exacto knife is (what we call a craft knife) and that is impressive as you must have had to score along precisely the same line more than once or be able to apply a lot of pressure and still control the knife!
No, I did it with a slow, gentle sawing motion, in one step. No scoring. But, keep in mind, I had been using one of those knives for 30-plus years, so it was no big deal for me.
CD