Anal advice? Help 😭

This will be my 2nd time doing anal. We will be using coconut oil and a condom. The first time we did it, let’s just say things got messy. Tonight I shaved very good and I’m using the bathroom one more time. We will be doing anal tomorrow so I won’t eat anything until after we are finished so that I won’t need to use the bathroom. Can i get some advice overall?? How do I keep it clean??