I had my baby Neutered on 12/28 and he acts the same way he did than before the surgery. I think people tend to say a dog is going to act a certain way based on personal experience. When every dog is different as well as the owners are different so i guess you would have to see how he acts after you have it done. Right after his surgery i tried not to baby him to much so that he wouldnt get used to it i mean dont get me wrong i hugged and kissed him alot but didnt over do it.
So i would say wait till after his surgery and post your comments on his behavior and it will be a new experience to share with all of us.
Keep us posted!