Hello Christina, and welcome!
Good insulin, sensible starting dose. Good advice to feed wet food.
Quite a few cats have the potential to go into remission. And many of those who do so tend to do that within the first six months after diagnosis. But some take many months, or even years... It is pretty unusual for a cat to go into remission within a couple of weeks, but it has certainly happened here on rare occasions. ...And quite a few never go into remission, but can still have good lives on insulin.
Estimates differ about the actual numbers of cats that go into remission. Recent research from the Royal Veterinary College in London showed that about a third of cats in the 'general population' of diabetic cats will go into remission; but that rate increases when the cat has a committed and pro-active caregiver, and also a good diet and good insulin. Be aware though that remission isn't necessarily permanent.
How often are you testing blood glucose?
Before each shot?
During the insulin cycle as well?
...Occasional tests never tell the whole story.... High blood glucose levels can be caused by too much insulin as well as by too little...
It does get easier. It's a new routine and can take some getting used to. But putting effort in, especially in the early weeks and months can be well worth it...
While it's usually important to ensure that a cat has food on board when getting an insulin shot, many of us actually also 'free-feed' our cats. But if it's possible to remove the food a couple of hours before the pre-shot blood glucose test, that is a good thing to do also (so the preshot test isn't influenced by food).
Sorry...but there is no logical reason whatsoever for only testing weekly...
It's important to test before every insulin shot so that you know it's safe to give that shot. Testing is a quick, simple, and painless process.
After that, it's incredibly helpful to know how the insulin is actually working in your cat's body. So, some tests at points during the insulin cycle are always a good idea.
Lantus is dosed on the lowest number of the cycle, so it's important to know how low your cat's blood glucose is typically dropping on this dose.
Ongoingly, any extra blood glucose tests you can get will be helpful, even if you can only get one extra test before you go to bed each night. And occasional 'curves' (tests done 2 hourly after a shot) can give valuable information.
Not important at all. Much of it is low quality and it's overpriced. Ordinary everyday low carb food is just fine...
Newly diagnosed cats are often ravenous because they can't properly process the food they are eating. Hence many of us free-feeding or using timed feeders...
Christina, I know it's all a lot to take in at first. But it honestly does get easier, and even routine...
Huge reassuring hugs to you!
Do post on the main health forum if you need more info or have more questions. You will catch more attention there. This welcome forum is really just for saying 'hello'.
Eliz
...It ain't all bad.... 
