If you have plenty of paint on it then wet sand with 2000 grit, lots of soapy water, VERY light pressure, as Tomcat says be very careful around swage lines corners etc etc, If you have painted it with rattle cans then there wont be that much paint on it and cutting through the paint can happen very very fast indeed. Its not hard, but just take your time and don't rush anything.
I used 2000 grit then followed with 3000 grit, then used SMALL amounts of G3 on a rotary, lots and lots of water. A lot of the G3's break down from a rough cut to a fine polish now which makes things easier, after G3 then use a less aggressive polish ( I used auto glym super resin polish) then use a finishing polish.
If you've not done it before then the tendency is to go too fast, especially with the rotary. I cut through the paint 4 times when I first tried it. The wet sanding is the easy bit, its the rotary that will catch you out.
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