Oral sex?

So my boyfriend has really been wanting to go down on me for a while. We have been together for almost 2 years and have done Everything except that, and have sex. To be honest, I'm nervous because I'm worried about it smelling etc. I know he won't judge me because he isn't like that, But does anyone have any ideas on how to make me a little more ready and help give me ideas with the hygiene aspect of it? Thanks!