some dealers will post the paint to you .800 grit will be quicker and is necessary to provide the correct key for new paint to adhere .
build up the paint with the touch up stick and allow to dry for a few days ( heat , for example from a hairdryer if you can borrow one from your gf will dry paint quickly ) .the paint will shrink .
use 1500 grit wrapped around a pencil or similar to flatten new paint level with original paint , you can use 2000 grit near end of process .it will look dull . you can clearcoat at this stage and then flatten with 2000 grit .
use T- cut scratch remover or similar ( but not rubbing compound ) to polish paint then use a fine polish then wax .