NO WORRIES
My Chachi was neutered at 5 months of age (4 months ago) and it was so much easier than I thought! It really is not that big a deal, in terms of invasiveness. For female dogs, it is much more involved with a longer recovery time. Chachi's stitches were on the inside, so he couldn't chew them, and they just dissolved on their own. No drugs, no elizabethan collar...nothing!
Brought him in in the morning - picked him up in the afternoon. He was very groggy which was expected then he wobbled over to his bed and konked out. Later, I fed him some kibble by hand. The next day - he was a bit better and by Day 3 he was running around like nothing even happened.
Honestly, no big deal. He'll be fine! The only tip I'd offer is to not let him jump around a lot the first few days. Let us know how it goes!