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If you've been shooting yours a good deal already, it's not likely to have as much effect as if it were fresh out of the box.
There are a couple of spots that really benefit from some polishing.
The inside surface of the trigger return spring housing is usually pretty rough. If you can roll up a piece of sandpaper and smooth the inside of the housing that can make the trigger feel much better.
If you have some fine ceramic stones, it usually doesn't hurt to very carefully smooth the openings in the frame where the trigger and hammer move. Those can be rough sometimes and cause a little bit of drag on the hammer & trigger.
I usually try to polish the top of the hammer strut to make sure that there's no roughness or grittiness in the cocking motion of the hammer.
When you're done with all that, the odds are that your trigger won't be significantly lighter if you measure it with a gauge. But it will feel much better.
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