Anal sex

Good morning.
I'm straight and I want to try anal sex with my partner. I have been talking about him a long time already and give him all the reasons to try. By cons, two of us, no one has already practicing.
Once one can have a try but it did not want too, I continue result in the opening abituel.
Good on you do not really try, it was more for fun but does not prevent AC does not seem facille ...
I have my little ideas behind the head so that it goes well but I would like your advice and testimony if possible;)