IF yours needs the rampectomy, you don't need power tools. Even though I have a Dremel, I didn't use it on the feed ramp because I didn't want to remove too much material too quickly. The 'smileys' I was getting were pretty pronounced and I was of the opinion that the cause of those smileys had something to do with the occasional but all to often failures to feed that I was getting. Polishing the ramp had helped with frequent failures to feed but I was still getting a few. Also, I was concerned that the damage caused by smilies to JHP ammo might interfere with the JHPs opening up. This was not as great a concern with the Hydrashoks which are in my primary carry mag (they seem to be a little shorter and don't get banged up as badly by the ramp) but the Remington UMC JHP that I carry in my backup mags showed pretty marked effects and I figured that would be the case with most other JHPs, even premium stuff, that isn't as truncated in the nose cone section as are Hydrashoks .
I modified my feed ramp with a file (it was a little bigger than a needle file - though I used needle files to modify the barrel hood) and sandpaper. It only took about 20-30 minutes, including polishing it out with very fine sandpaper when I was finished - and I was a little concerned, at first, that I might have taken off too much. Thankfully, it doesn't seem as if I did. With the way I reshaped the ramp, I still observe light 'smileys' but haven't been having the failures to feed and the damage to the HPs isn't nearly as bad since I did that so I am not all that concerned. I am nowhere near being a gunsmith, even an amateur one, but the info I have found through KTOG has helped walk me through these modifications.