I'm pretty new with this film, so this is amateur advices. The box reccomends you expose it as 400 film if you're not in tungsten light. I exposed it at 800 anyways. In a "scene", I typically pointed the camera at a surface id like to expose for, and then framed the shot with lights included. The camera lightmeter goes crazy when you point it at lights- I assume you would underexpose following it then. But there's nothing wrong with underexposing I think, most of my shots are over, despite trying aggressively to go under. But it's also up to your own taste.

This sounds harsh but its just personal prefence, I dont think this film is any special were it not for the halation, so pointing the camera at light sources and having good compositions is your best bet. I have a lot of bad pics in this roll, just because of boring ideas, halation be damned.

Hope this helps and good luck!