Get a set of stones and skip the power tools. I have used a cratex wheel on 1911 feed ramps. As far as trigger jobs you had better have a thorough understanding of what your actually doing before taking it on. You dont want a gun that fires when cocked or bumped. I have used a china stone on the sides of all my trigger components and you would be amazed at how much smoother things will get. When you move to polish the hammer and seer, as others have said, there is no "polishing" involved. Also very easy to make a dangerous gun by changing an angle.
Concentrated power is not rendered harmless by the good intentions of those who create it.