Having sex for the first time

So I’ve been thinking about having sex for the first time with this dude. I’ve known him for awhile and we have talked about it a lot. He’s done it before so he knows what he’s doing. I don’t, so like what to i do? Bc I do want to have sex with him soon.... but I just don’t know what all to do or if it’s gonna hurt or feel weird. I just really want to know if it hurts bc that’s why I’m so scared