I'm new to this site. I have an Epiphone LP Standard for which I recently dropped the tune-o-matic bridge. It plays open strings and chords below the fourth fret beautifully. Action is where I want it. I studied the frets with Buzz Off (R) and where they require lowering. My question is this: if I simply want to spot lower some frets which I think will resolve the slight buzz above the third fret, would it make sense to begin at the highest elevated fret (21) and then work my way lower until the problem is resolved? Thank you for any suggestions.
Have you checked the relief of the neck? Buzz on frets 1, 2 and 3 is usually a sign that the trussrod is too tight and the neck back-bowed.
To do a good fret dress you need:
Sanding blocks, preferably a flat, long one that covers the whole lenght of the finger board plus a radius block with the right radius, probably 12" in your case.
Crowning file, fingerboard guard, steel wool.