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First question why? It's doable but it's a Cooey just remember it's called polishing sears not filing sears.
I have changed a couple of triggers they can be quite tricky there is a small trigger spring that is very hard to put in without removing the hammer and does fly quite far if you just remove the hammer spring and trigger so keep your work area clean or you will spend time on your hands and knees looking for it. Luckily for tools all you need is several all you need is several good punches, Philips screwdriver and a long 7/16 socket and a lot of patience.