Gauvins, have you ever changed cables and housings? Do you have a cable and housing cutter? This tool is actually one tool that I really really appreciate buying a good one, just because it makes these jobs go so much easier.
You also want a file, and some sort of awl, ....
My Sram cable cutter has an awl built in at the end of the handle. It is the only cable cutter I have used in decades, so can't comment on others. But the Sram works great.
I also keep a small bottle of cable ferrules, both 4mm and 5mm.