I got bored of waiting so I put nougat on with Odin as per the instructions above. Really easy, I was just waiting for the OTA just out of laziness really, but I needn't have bothered as it was that easy.
Nice little difference so far in speed and a few nice touches. Looks a lot better too. The ringer noise when I call someone sounds a bit odd now though and if you look REALLY closely you can see that FHD is a smidge less sharp but you have to be looking very close to see the difference. Not a bad little upgrade overall.
I get this noise as well thought my speaker was faulty at first