Help!!!! Any tips or advise??

Li

So the guy I'm talking to is into anal and I'm down to do it but I'm really nervous and he's pretty big too😩 I'm very open to stuff like this. I'm really nervous because stuff is supposed come out and not go in😅😅 Like how do I prepare and stuff like that?? Does it feel good?? Will it hurt really bad?? How do clean that out?? cuz one of my fears is there's shit on his dick and that's not cute.