Hi there
Welcome aboard!
I also have a sugar cat named Tiggy..(I also call him Tigz as well). He is 15 yrs old and started out at 18.1 lbs. With his diet change, and his initial insulin, I can tell he's lost a few pounds. He was able to get off insulin and only be controlled with his diet, but as they say here on the FDMB, every cat is different.
When Tigz was diagnosed in April, I initially had difficulty doing his BG testing as he was super wiggly. Although some people test on the paws as well as the ears, I've only tested on the ears as I was worried about him using his litter box. Others who use the paw say this hasn't been an issue. Find what works for you.
I also used the suggestion from others in utilizing a "special place" to do the blood glucose testing as well. Some people do it on a counter, but I use a special wicker stool. Once Tigz realized that if he sat still on his wicker stool while mommy "poked" his ear for his BG testing, and that he got a low-carb treat afterwards, he actually looks forward to this activity. He'll even jump up on the wicker stool expecting a treat even when it is not time for his blood glucose testing!!
I think the diet change makes a huge difference along with the insulin. All the suggestions, info and advice from the experts here (I.e. BJM, Margie and Gracie, Ella, Rusty and Stu, Mogmom and Goofus, et al.), are fantastic!
Everyone is here for you and definitely knows what you're going through.
You can do it!
Best Wishes!