It's really difficult but I try to be as honest as possible. I tend to omit the things I know I could lie about because I don't feel ready, but she knows it just looking at my face and we know that everything will slowly come up. I really like my T and want to do my best to help her help me.
I exaggerated something once, but I think it was more an unconscious exaggeration resulting from anger or frustration (?!) because I myself thought about it for a few seconds and realized that I didn't really perceive it that way so I corrected myself straight after.