Trying anal

So my bf is really into butt play. He’s very sweet and understanding that it’s very new to me and I’m not as comfortable with it as he is. He eats my ass a lot and We’ve tried butt plugs and that was actually enjoyable and he wants to work up to having anal. I’m a bit nervous. I told him I’m super worried about 💩 during / after and he told me he wouldn’t think I was gross or not expect it because it’s an ass. Any tips to make the transition from butt plugs to anal and maybe not pooping ???