What do they do for a trigger job?

I did mine so long ago...let me think here...I know a spring kit was installed. Then judicious polishing of any bearing surfaces. Then, of course, proper lubrication. Mostly done under magnification. It turned out awesome and was very rewarding. I also radiused the exposed edges of the hammer and trigger to remove any sharpness...also any rubbing on the sides. The beauty of stainless, no "refinishing" required. Just choose from a high polished hammer & trigger or take a 3M pad to them for a "brushed" final finish. Not claiming to be a gunsmith, it was a fun job...and you can say, "I did that". If you want to do your own, that is.