JDW,
There've been some good comments and recs, especially Jim's above. He speaks from experience. My experience with sharp dents has shown that some dents will come out with nearly no visible signs of having been there, without re-blueing, but it's really dependent on not only the dent, but the technique used too. Some working of the metal is always detectable to one degree or another. Dents often also displace some metal like a crater in addition to simply bending the metal. Some will be so slight as to not show the cratering and may be removed with soft metal (brass) hammers and may be acceptable visually after removing the dent without refinishing. Some will have enough metal cratered/displaced that it will need a steel hammer to reform (cold forge) the metal back into shape and usually is not acceptable without restriking (file/polish) and refinishing in these cases. You'll have to rely on the 'smith that does the job to recommend the medicine for the dent after he sees it.
