I just need a little hand-holding. I do NOT want to replace this nut. I measured my fret height at .048". I am stacking two feeler gauges (total thickness of .051) against the nut and CAREFULLY filing. About 20 iterations so far. I am trying to get the .005" feeler to make contact between the 1st fret and the string, with the string fretted at the third fret. Once I am there, I may not have the guts to continue down to .003" or .0025". In the meantime, I just want some hand-holding. Am I doing the right thing? Will I safely not screw this up, as long as there is .005" clearance at the 1st fret, with the string fretted at the 3rd fret?