I think it is not the most scariest part of the buil, but the most critical. You screw the neck, no matter how good the guitar is, it is worthless!
And the neck per se is not the hard part, I find carving a body more challenging, but the fretting! Even the bought ones need a bit of work! to Include Carvins and Warmoth. Of the 4 necks that I have boought (not that many) all of them needed a bit of attention.
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Yes. It's the most critical. That's why folks are "scared" off. Not sure what you're saying though. On the one hand you say the neck isn't the hardest part but then you say fretting is. Fretting, that is, cutting slots, dressing, etc. is all part of the neck no? Also, fret dressing is also an art in and of itself. Properly levelling frets is something most who try, think they can do correctly. Takes dozens of tries before you really know what you're doing.