To keep my frets in shape and to round over the occasional fret protruding the fretboard edge (on budget instruments) I never used anything more sophisticated than a nail file (emery board), finest grit sandpaper, a good scraper and most importantly, very fine steel wool (the kind one uses to polish things). And to inspect the fret ends I use a decent magnifying glass to really see where to work on exactly and check the progress. Never had any problems in 25yrs of doing it that way, though finished maple boards need some extra attention as to not damage the finish.
Of course, in doubt better have it done by a qualified luthier / repair shop but it's not that hard to do it yourself.