It's possible, Sometimes psychotic has posted a lot of information about CBT for psychosis so it can be done.

I just want to mention though that just because you don't hear voices doesn't mean it's any easier. Elyn Saks seldom hallucinated but her illness was completely debilitating to her without medication. I don't hallucinate like I did even a year ago, my illness has changed over time. Now I mostly struggle with delusions and thought disorganization like Elyn Saks did. I'm still very debilitated by this illness. Medication is the only thing that's helped me be functional at all. Without them? I'm curled up in my bed moaning about my delusions and not making a particle of sense to anyone else because my thought disorganization is so bad.