I haven't been dx'd with sz at all, but I do deal with voices, and periodic delusions.

I find the following things helpful:

For the delusions, having someone really close to you that knows your baseline behaviors and will challenge me when I start thinking...off. I may not believe them, but eventually when I realize what was happening and start to come out of it, I can recall that the close person to me was alerting me to it the whole time.

I take omega 3 supplements, which I believe are helping my brain function and cognition.

I found changing my outlook on the voices to be a very helpful thing. I don't always understand what they say about me or things buried deep inside my mind, but I try to analyze why I may be experiencing them. It makes it less distressful for me when I don't look at them so negatively. That doesn't mean it isn't hard though; sometimes they can menacing and make life stressful.