Hi, welcome to YT
I had Wicket neutered fairly recently, at six months, and he did great - in fact it was a struggle to get him to keep still that evening...he just wanted to run and play!
It is worrying when the time comes to spay/neuter, but I believe the benefits outweigh the risks.
Good luck with whatever choice you make for Muffin....looking forward to seeing some pictures of your little guy! xxx