How Can Neutering Change My Dog?

So I have a 2 year old German Shepherd / Husky mix. He's 3/4 Husky and 1/4 GSD. He is smart, well trained, and behaves very well. In my eyes he is the perfect dog for me. I am planning on finally getting him neutered now that he is fully grown. I have been told he might change and might require retraining and now it's something that I want to prepare for. His current behavior is like this: He is sometimes nervous when meeting new people or hearing sudden loud sounds, but never an issue on walks. He only barks when in guard mode, but with one snap or command from me he sits quietly and waits. He is not aggressive at all, he will always smell someone when meeting them and after a few seconds of familiarizing he goes into friend mode. He doesn't have any bathroom issues indoors, he isn't territorial (will ask to get on the bed and will get off if I say "off" right away). I can put my hand in his bowl while he's eating and no fear of getting bitten, can take away his toys without worrying of a bite, he has never bitten anyone. He has never been in a fight he's started, just been in 2 fights (if you can even call them that, he just barked and snapped at them) where he was attacked, and after snapping back at the other dog he'd walk away. He humped 2 dogs when he was a puppy and after corrections he'd stopped and never has humped another dog, person, or object ever since. He's crate trained, will growl when there's a knock on the door, but after a correction he sits and waits for my reaction or command. I can leave food in front of him, go to another room, and come back and he won't have touched it.

Like I said, he is perfect in my eyes, but now I'm worried he might become insecure or require training that I may not be ready for (I have been training for a few years and was a professional trainer for 2 years but not behavioral.) so I just want to be prepared.

So I have a 2 year old German Shepherd / Husky mix. He's 3/4 Husky and 1/4 GSD. He is smart, well trained, and behaves very well. In my eyes he is the perfect dog for me. I am planning on finally getting him neutered now that he is fully grown. I have been told he might change and might require retraining and now it's something that I want to prepare for. His current behavior is like this: He is sometimes nervous when meeting new people or hearing sudden loud sounds, but never an issue on walks. He only barks when in guard mode, but with one snap or command from me he sits quietly and waits. He is not aggressive at all, he will always smell someone when meeting them and after a few seconds of familiarizing he goes into friend mode. He doesn't have any bathroom issues indoors, he isn't territorial (will ask to get on the bed and will get off if I say "off" right away). I can put my hand in his bowl while he's eating and no fear of getting bitten, can take away his toys without worrying of a bite, he has never bitten anyone. He has never been in a fight he's started, just been in 2 fights (if you can even call them that, he just barked and snapped at them) where he was attacked, and after snapping back at the other dog he'd walk away. He humped 2 dogs when he was a puppy and after corrections he'd stopped and never has humped another dog, person, or object ever since. He's crate trained, will growl when there's a knock on the door, but after a correction he sits and waits for my reaction or command. I can leave food in front of him, go to another room, and come back and he won't have touched it.

Like I said, he is perfect in my eyes, but now I'm worried he might become insecure or require training that I may not be ready for (I have been training for a few years and was a professional trainer for 2 years but not behavioral.) so I just want to be prepared.