But before installing the fretboard it is wise to smooth the fret ends. Much easier now than when on the instrument. This fine file does the trick.
Now the fretboard can be carefully positioned, glued and clamped.
Now the glue is dry and it is time to shape the neck
The sharp chisel trims up the joint where the side enters the neck and shapes some of the curve of the hook.
Then a coarse rasp followed by a fine rasp, and lots of sanding shapes the neck.