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A fine knife honing stone works well too.
Go slow, keep the existing angles/profile...just clean up the contact surfaces betwen the sear and hammer first to remove the "gritty-ness" of the trigger pull. Often just doing that will "lighten" the perceived pull of a trigger significantly...and poses little risk.
If you have not adjusted positive and negative engagement angles before...to NOT try them for the first time on your new sear and hammer. Try it out on a some stock sears and hammers first. (although taking the chromed coating off the stock parts will expose the softer metal underneath...it'll hold up in use long enough to practice and experiment).
Even with steel parts, I wouldn't try to shorten any of the sear/hammer hooks until there was some wear on them. Then you can see the engagement surfaces clearly and how much you can take off (if any).
Polish the sear surfaces? Great to do right off the bat. But I'd wait until after some use before doing any of the other stuff.
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