my input to this would be:
be very careful if using power tools as misuse and 'heavy hands' can lead to taking too much off and making bigger scratches which will take you longer to polish out when moving on to wet and dry!!
the metal is very soft so i found that there wasnt really any need for power tools!
to do the fuel rail cover i removed the cover via the two 10mm bolts with a ratchet and 10mm socket with a small extension (to reach the bolts)
i then proceded to polish away in my front room lol
i am currently doing the inlets whilst on the car, but making sure to put down covers under the pipes and regularly using a hoover to clean up any bits of metal/dust (u can just take it off if you want to)
to polish i am starting off with some aluminium oxide paper to take off the main 'ruffness' of the metal and then proceding to move on to the wet and dry. i have bought 120, 400, 600, 800, 1200 and 1500 grade wet and dry and basically i am moving through the grades once i feel that each grade has done all it can in terms of removing the scratches!
once the surface appears to be scratch free i am using autosol metal polish and giving it all a really good rub and repeating this loads of times using my electric buffer to bring up the shine!!
once this is all done you should have a good mirror finish
by the way i purchased my wet and dry for 2 quid a pack for each grade and you get 4 sheets in each pack from halfords, the autosol was about a fiver for a tube
i still have loads left and cut small strips of wet and dry up so as not to waste any
hope this helps in some way gaz
andy