After looking through StewMac and Warmoth, I'm wondering about working on the nut. I'm not there yet, but am trying to anticipate tool expenses. What tools are most vital for cutting out the slots for strings in the nut? I'm thinking about buying the gauged files for proper sizes, and then making do with the tools I have around my shop already. Is there any other tool or tools that are vital to the nut slotting process? I've already got files available for shaping the nut.