Headlight housing comes out fairly easily so you can work on it separately from the bike. As long as it looks like you've gotten all the bolt out just slowly pull back on forth on each side and it should come out. If it feels like there's a hard point then look around for a bolt.
I took my housing out to install my led bulbs and it was the first time I'd taken the fairings off the bike.
2015 Ninja 300 SE