There's a fine line between well-used and abused. And it's really easy to go too far. Figure out first what you want... too much is usually not a good thing and it can't be undone. Coarse sand paper, rock tumblers, a Tupperware full of coins, they all give different results. Honestly the best results come from initial edge softening (I use coarse sandpaper) then wear the hell out of it and polish it a lot with your tshirt. Like I did with this one: