In regards to the lampshade...
If you find your dog hates it, won't wear it, gets depressed, etc., two things you can do as an alternative:
Topic spray, an bitter tasting antiseptic spray, available from your vet. Most dogs will not lick or pull at stitches if the wound is sprayed with Topic - and it helps keep the wound clean. Of course, ask your vet first if this is appropriate for your dog.
Onesies/Panties. No kidding. If your dog is bothering the wound, a pair of boxer shorts (for a larger dog) or a baby onesie, or a child's one-piece swimming suit covering the stitches is a great thing. Obviously, you will need to cut the back seam open a bit for his tail, and if there isn't already a front opening as in boxers, do so so that he can urinate. Or take the clothing off while you walk him on leash. Yes, it looks ridiculous, but better than an opened wound. Onesies/bodies/Swimsuits are more secure than boxers, but harder to get on and off.
A long t-shirt, tied in back or stitched to make leg openings, will sometimes work, but I prefer something more secure for a male neutering op wound.
Other than that, most dogs bounce back quickly - the hard part is keeping them relative inactive whilst healing. My 14 year old with a bad heart was just neutered - and was bouncing around again like a youngster in two days.
Hope all goes well with your guy - it's the right thing to do... but of course we all worry until we get the 'he's fine, come pick him up' phone call.
Give the little guy an extra cuddle from all of us here.