Congrats on getting an interview!! :-) I might have over prepared, but I wrote out answers to the 5 or 6 questions that my recruiter emailed me, as well as the 20+ potential questions that I found online. I also can get nervous and forget what I want to say on the fly, so I studied my answers so that I wouldn't have to look at my notes. I think it's okay to have your notes handy, but as a recruiter myself, it can be a turn off if a candidate is reading their notes during an interview.
Best of luck!