Cutting your own nut is a bitch, at least it was for me, it took me two tries to get it the way I wanted, I guess it depends, Im very picky with my setups, I was lucky to borrow a guys nut files, it really helps to have the right tools, I play 8's, really thin strings, most precut nuts are more like for 10's, so basically unless your going to play a non typical string guage, or have an extremely high or low action, like me, i always lowball it, fenders are supposed to be buzzy anyways, hehehe then try the precut nut route, if not, then get a good set of files, from stewmac or somewheres like that, or try one of these out, i think my next 2 projects are going to have earvanas on it, http://www.earvana.com I have been wanting to try it out, just take your time, carefully think about what string guage your going to be most likely playing with, and take baby steps in sanding the bottom and filing the slots as once you taken too much away, its time for another blank and start all over again if you have any other questions ill try and help out
jeremy