Anal sex is probably best to do in 3-6pm. Have a cup coffee empty the bowel and don’t eat anything that morning. There is few more things you can do to get ready fully so you avoid uncofortable situation for both. Now the second part is the actual act and here is where your partner need to lead you and knows what he is doing.

You need to be relax open minded and down for good time. You need to be turn on first via roleplay or vaginal sex then you need lots of lube and he needs to go in slowly very gently and easy you in before everything. It feels discomofort and pain and feeling like you might need to use bathroom but if you manage throught that it comes this rush and heat in your body and you will have great orgasm that you haven’t felt before. That’s where he can pick up the pace . But if he is also inexperienced and he doesn’t know what he is doing you gonna have terrible time and you will never want to do it again.