would strongly recomend not to do it with an angle grinder. the rotarys we use in the trade are vary speed.
would say that getting it done by a pro is your best bet really so you dont f*ck your paint up.
the attachment comes in different grades of foam either on a fixed plate or with a velcro backing which attaches to a plate, depending on how f*cked your paint is determins what grade of compound used on the pads.
it would take ages to type out a full detailed explanation of how its done etc, at the top of the detailing forum theres a rough guide to detailing, my advise would be to get done by a pro,watch how he does it and then buy yourself some polish/sealent/wax to keep your car looking sprite
