Oral sex help!

Okay gurus!! My fiancé wants to have oral sex and I'm so nervous. I've done all the googling and asking close friends that I can do lol. He's done it on me but I get nervous. He wants to 69 but I'm so nervous. I just change the subject instantly. Like what if I bite him or maybe I don't bite him but I'm so horrible at it that I wish I had've just to break the awkward silence afterwards. Idk 69 might be a good thing for a first timer because everything won't be focused entirely on me. HELP MEEE 😐