Rip,
I just convinced my regular vet that had looked after her for years.
He put an IV ( i guess) in a vein in her foreleg and all I had to do was inject the solution through the rubber cap into the IV cup.
It took me a while to convince him that I knew what to do and that I could do it right.
He hung back aways on standby but there's no real trick to it.
I had that pup from her 49th day until 11 1/2 years later. I figure I owed it to her; as you said, no room for strangers when the time comes. It's time for mutual respect and mercy.