use a sanding block with the wet and dry and try not to touch the surrounding paint
when it starts to get nearly level you wont be able to avoid it mind ,
use an 800 grade or something to get the bulk off then 1200 , 1500 when it gets to the point where the surrounding area might get touched
use plenty of water on the wet and dry
use a decent polish and the scratches from 1500 and even 1200 wet and dry will easily polish out
supposedly you should then clearcoat the chip again and wet and dry and polish again but it depends how rough the original application was ,need to judge it for yourself really
you wont get perfect results but it shoudl be better than before