First time oral

Sooo the other day my boyfriend of a year and a half asked if I was okay with having oral, we are both virgins and I am okay with it, but I got scared and said I don’t know because I’ve never done it before and he was like well neither have I. And he said he’ll wait until I’m ready, he’s super respectful, and I want to but I don’t know how and I’m kinda nervous/ scared... so any tips on the first time so I don’t embarrass myself?