Advice on anal?

Kayla

So my boyfriend and i want to try having anal but everytime we start i get cold feet, but I'm really interested in trying. I'll be honest im so scared I'm going to poop myself or on the bed or something. Do you guys have advice on what i can do to prevent that or what helps in making it comfortable. Weve been able to try a few fingers but yeah anything else makes me nervous and im pretty small.