I need some advice ASAP

I’m really insecure about my vaginal area and my boyfriend of 1 year has been begging me to let him go down on me . It’s going to be both of our first time but he really wants to do it . I finally got the courage to say yes but now I need advice .. I have a couple of days until I can see him and what can I do in the mean time to help me be more “fresh” down there? What do u recommend eating or doing ect . What should I do on that day before he comes? I really need your advice and how can I stay calm? Sorry I know it doesn’t make sense. Please help me 💜