Preparing for my first interview in 5 months - what worked for you?

I get tongue-tied when I am asked about my weaknesses. I would rather hear the honest version than the polite one. The role is similar to my old job as a machine operator. How do you prepare answers?

Thanks for writing this out. I went through something close to it 5 months ago, and it settled down once I kept a simple log of every call and form.