anal?

So my boyfriend started drinking beer a lot after he turned 21. Ever since our baby was born he started to drink a beer everyday. It bothers me so much because my dad died from being an alcoholic and I don't want him to be like my dad. So I had told him to calm it down and he did. But it was still 1 beer a day. So I told him if he stops for atleast 1 month I would give him anal. He's been very excited for it but I'm terrified!!! I just had a baby in September and the skin between your vagina and anus tore and it's open still even tho they had seen it. Anyways my question is how was your first time doing anal and can you give me some pointers