It is easy mate. Get it off. Sand with various grade of wet and dry. Start with 800 grade then use 1200 then finish off with 2000. Get some PLASTIC primer. 4-5 coats of primer then sand again till your happy with the smoothness. Apply 4-5 coats of your desired colour building up the layers gradually. 15 mins after the final do your first coat of lacquer then apply 4-5 more coats after that. Be careful when applying the lacquer less is best with it as too much will create runs and ruin all the previous work.
I think there might be more info in my build thread as I did the same with my valances.