It's a little bit of work and patients. Just doing the Barrel isn't bad (cause not much of it is seen) when you get into doing the slide it becomes tedious. If you plan to just polish what's seen from the extraction port that's the easiest. If you go all the way to the muzzle you will get the barrel smiles. Only they will be dull instead of shiny. Anywhere you have a shiny rub now will become a dull rub once that piece is polished unless you tackle the cause as well.
Keep in mind polishing can be addictive.