It's hard as shit. You need all the basic skills with woodworking, and knowledge of the tools, as well as knowledge of guitars, woods, and materials. And the trick part is you have to be super fricken precise. Don't plane the fretboard correctly and the guitar is barely playable without an expensive fix. Make the scale wrong and the notes wont fret properly. A few minor mistakes can make the guitar feel or sound poor. There's an insane amount of detail and knowledge involved, with things like kerfing (i think that's what it's called) and bracing on the inside that seem super small, but are crucial to making a quality instrument. It's a lot of hard, precise work that requires a lot of knowledge. But it also seems like the kind of thing that would be insanely fun and rewarding. My advice would be to research it (just google 'how to build a guitar" and read some of the results) and see if it's something you think you can handle. Even as a guitarist, i was surprised by all the steps involved. But it's something that interests me a lot and i'd like to attempt some day myself, as a hobby. If you're interested in making a career out of it, i say go for it, but make sure you know what youre in for.