Nervous about neutering

https://preview.redd.it/27i19kvxq2vf1.jpg?width=718&format=pjpg&auto=webp&s=cddb016beea4c06c57ee46b4f72fe6e228b05bd4

Well, he's not. I don't think he understands the concept. But I am. His appointment is Thursday. They're keeping him overnight.

Any advice?