All i did was use a electrical sander to flatten off the manafold (using 800 grit) whilst still on the car then stright on to the 3 stage polishing set i bought and there ya go. Recomend useing stage 1 and 2 for atlaest 10 mins each, stage 3 just makes it real shinny.
There is very little mess. But i covered up the engine with a old sheet.