FIRST TIME ANAL PLANNED THIS WEEKEND?! advice please huns x

My boyfriend has been wanting to anal for so long and has been asking loads and I’ve finally agreed to it last week for it to happen this weekend. As the days come by I’m getting more and more nervous about it as I don’t want anything to go wrong with it and I of course want to give him what he wants. He has never done this before and neither have I so neither of us know what to expect and my main worry is just something going wrong. I trust him enough to experiment this intimate moment with him. Any pre tips I should do and overall some advice on the experience please x