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It's easily accomplishable by emery cloth. I did it the first time by hand by going from medium to fine to extra fine. You can go the extra step with a buffing wheel and some jewlers rouge if you really want it smooth. I didn't and it worked good for me. Just remember not to play around too much on the surfaces that the hammer and sear hook together with.
I never use oil in semis. Oil collects powder residue.
I treat the parts with moly-slip or militec, clean with solvent, and use a dry teflon lube.
Never seen any rust on any of my 10/22 action parts, even after sitting for years with no oil.