Anal advice

Rags • 🦄🎭🌌🎮🍰☮
So my boyfriend has been wanting to do anal for a while. The only thing we've done that's close is him putting his tip in but then his mum came home so we couldn't go any further. I've heard so many stories about people shitting on the SO or it hurting a lot. I'm looking for dome advice like what's the best position for the first time, how do you prepare yourself and things like that.