Help and tips asap!

So I'm wanting to try anal tonight with my partner itll be our first time doing it any tips besides lots of lube and relaxing? I'm also doing a cleanse with water.

He isnt expecting it tonight so wish me luck ( if I even get the courage )

Update incase someone wants one

It went well it stopped fast because it was hurting but it wasn't as bad as I expected he used a lotta lube and we will be trying it again soon more detailed update then hopefully ❤