I want my FOV to be 80.

I've read I should add this line fDefaultWorldFOV=80.0 to my ini. under the display header. Then enter the game and in first person press the TAB key, and when I TAB out again my FOV should get updated.

Problem is, nothing happens. My FOV doesn't change. What could I be doing wrong?

You could try an alternative and type the FOV you want into the console. Bring it up with ` and type FOV 80, although this doesn't save between games.

In skyrim.ini under the [General] section:

fDefaultFOV=80
fDefaultWorldFOV=80
fDefault1stPersonFOV=80

Run the game, press ~ or whatever key is on your keyboard to bring down the console, type FOV 80 and save the game. That's it.

Thanks, I'll try that.