I have a diabetic cat. Is yours insured? It makes a huge difference.
He has been quite tricky to stabilise, with plenty of stays at the vets for a glucose curve to be done. This is to decide the dosage of insulin. So they check the glucose every few hours to track its lowest and highest point.
When we started out cat had 1unit twice a day, it gradually increased over time (and many glucose curves) to 6 units twice a day - this is a lot! He's improving now though and is back down to 2 twice a day.
The insurance, pet plan, have been brilliant.
The injections are simple, a syringe with needle already attached, inject under the skin in the scruff. Very simple. I was used to injecting my horse on a much larger scale bit even dh finds it easy.
I feed royal canin diabetic dry food and think it helps.
Cats can actually recover from diabetes, which mine seems to be doing. If you have any questions I'd be happy to answer.