Mine got neutered on 3/17. He also had 14 teeth removed. He was really sleepy for about 3 days and then he did tire easily for another couple of days. But he was running and jumping on and off the couch. I didn't like him doing that but he did it before I could get to him. He is doing great now. We didn't bathe him but he was ready for a bath; seemed like his head and face was kinda oily and greasy.
Good luck with your little guy! He"ll do just fine!