I started out with a pet specific meter, the Alphatrak 2, but the cost of the test strips is just so high plus they are hard to get when your vet's office is closed. I switched to a human glucometer, the Relion Confirm and love the fact that it takes such a small blood drop, 3 microliters, about the size of the head of a pin. Plus, the cost of the test strips is about 1/3 the price of the Alphatrak. I bought a Relion Prime to use as a backup but never had the need. The Relion Prime needs a 6 microliter blood drop which can be harder to get when you are first starting out home testing.
Warming the ear and plenty of low carb treats are key to home testing.
Personally, I never shot in the scruff of the neck. It was much easier to see what I was doing if I shot Wink in the flanks. It was very simple for me to see the tent and make sure the insulin had gone in because Wink had lost so much fur, he was half bald along his sides. ohmygod_smile It was a side effect of his uncontrolled diabetes. He had such poor glycemic control and was not regulated at all in the cat shelter so that he had huge nickel to quarter sized flakes of dandruff and the fur loss was part of that. Since your kitty is in better shape, you may want to consider having the vet shave a couple of patches of fur on his sides. Or clip a couple of patches of fur yourself.
You do what works for you and is easier to see that the insulin got in. Fur shots, where all or some of the insulin does not go in happen to everyone. Where to shoot is sort of like the preference for short or long needles. I always liked the 5/16" short needles but I know that member Kpassa likes the longer 1/2" needles. Personal preference. As long as you use the 3/10CC insulin syringes with 1/2 unit markings on the barrel, it's easy to measure those small doses and even possible to eyeball 0.25U increments.