Thank you all for the good thoughts but it's been a series of disasters.
Maybe I should mention that Romeo is a 15 lb, very strong and speedy, black cat who does not like to be messed with. I, on the other hand, am old and arthritic. When I tried to do the blood test he went completely nuts. He got away from me and I was not able to catch him for the rest of the day, so he missed his second shot.
When Romeo had an operation two years ago, I got a dog kennel for him to stay in while he recovered. He still goes into it. I told my husband to wake me up if he got into the kennel during the night and at about 3:30 am he did. I fed him and he ate well but I decided to wait until the morning to give him his shot in order to get him back on schedule.
This morning, I fed him again and got his shot ready. He was still resistant so when I tented the fold of skin to give him the shot, he jerked and I'm pretty sure the needle went all the way through the skin fold and he got none of the insulin. I'm waiting for the vet's office to open up so I can find out when to try another shot. Romeo is still securely lock in the kennel.