I'm almost a seasoned veteran at headstock mutilation.
It does take some practice to get right.
You don't need specialised tools (unless you have the cabbage to spare).
All I used was a hand saw and a coarse rasp.
Files and sandpaper to finesse the rest.

Tuning holes is another learning curve.
Mark them out accurately and if you don't have a drill press,
you can use this gadget that I used on string through holes.
https://www.youtube.com/watch?v=5SZA03DVITA

cheers, Mark.