This is a classical guitar that needed lower string action because the standard string height made it difficult to play chords clean without muting strings unwontedly and causing finger and hand fatigue.
Here as the frets are removed. You can see the fret slots are rough. I used a special tool I had made to clean out all left over glue and loose wood.
Before I start to lay fretwire, I sanded the fretboard and vacumed out the slots. I pre-curved the fret wire to a 10 radius so it would have more curve than the fretboard which was flatter with a 20 radius. Over the years I came up with a formula of how much pre-curve is needed depending on the fretboard that I'm working on at the time. So when I use my fret mallet the frets seat in very snug.
After I planed the sides of the frets I re-strung the guitar to check neck relief. I find this is important because I sanded the freatboard and using my specail notched level I can check the backbow of the neck only and she looks perfect. This tells me that, if I have a fret buzz, it is not the neck but would be the frets and some extra work filing the uneven frets to clear that issue up would be in order. As it turns out this re-fret job is perfect because there was no buzzing.