Step 2: Sand it down!
Now that you have the plain body, its time to strip the clear coat on the guitar. To do this, get your 320 grit sandpaper. Start by getting the sandpaper wet, and start sanding. Since this sandpaper is fine, it wont chew up the paint and make scratches. As you sand down, you want the guitar to be more of a flat colour, which means no shine. Make sure there is no more clear coat left on the guitar, because any will mean the paint won't stick on properly. If there are still little scratches left on the guitar, keep sanding until they are gone.
If you want to do the neck too, just do the same thing, sand down the gloss and sand the scratches.
After you are done, move on to step 3.