I've started at the front with the overriders and lights and fitted the nose cone vents. I know these are individual taste but my missus thinks they are great!
Fitting the vents is quite straightforward using body filler and holding them in place until the filler goes off. Then apply more filler underneath to ensure they stay put.
One thing that other builders have said - and they are right - is the fear factor of working on the car after paint. No more leaving tools on the wings!