Man, there is a LOT of magic to it. I have polished actions and done a good job - takes me maybe 2-3 full days to do just a highwall action and the lower tang, (ie, not the block, the lever, the hammer, or the butt plate). I'm pretty fussy about it but it's not even kinda simple. Sure, flat surfaces are easy. But a "thin" side highwall has concavities that are darn hard to polish in the longitudinal direction, and easily gouged out if polished orthogonal to that. And that's relatively easy compared to the compound curves that come up from the wrist with flats on either side, and small curves up around the receiver face (top and bottom) than have little surface to register your polishing implement with.
No, I think there is a ton of magic in there, and I would love to polish and action with a pro to point out what I was doing wrong.
My latest polished action is due back from the engraver (Ken Hurst) any second... I hope I hope I hope.
Brent