The first bass I "built" back in 2018. I use the quotes there because it started off as a kit bass, but a ton of hours went into bookmatching and laminating the top, laminating the headstock, dying the fretboard, making various wood covers, and spraying the finish. About the only thing I
hadn't done was a fret level, crown and polish, and that was keeping it from playing its best.
The frets were more uneven than I would have expected, probably because I dyed the fretboard with water-based dye, then finished in water-based poly, which must have caused some swelling in the fret slots.
Anyway, I set it up in my neck jig, then went over it along the string paths with a 24" machined level with PSA paper on it, then went parallel to the frets with a 6" Dia-Sharp diamond grit bar, then crowned, then polished with synthetic steel wool. It now plays great with the action nice and low at 1.3 (G) - 1.9 mm (E).
This was the first fret job I had done with SS frets. It took about 4 hours, and resulted in a few blisters, but the final result is worth it. I hadn't realized how shiny those SS frets can get when polished up!
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EDIT: should have said that the neck jig is basically 2x4s, some threaded inserts, some threaded rod, some coupling nuts, some cap screws and a ratchet strap. Cost about $25 to build. The 24" machined level is just an aluminum box level, cost about $16. The only other specialty tool is the crowning file, and I think that was about $30. Bottom line: you can do a good fret job with minimal expensive tools!