My cat has just been diagnosed with diabetes, can diet alone control it?

The reason I ask is that it will be VERY difficult to give insulin injections twice every day at the same times as members of the family are always coming and going and having someone at home at the right times will not always be possible.

Could it be possible to switch to a more regulated diet and keep things in check? By the sounds of things once insulin injections are begun it must be continued.

Also I've read alot about the dry vs wet food, but our vet has assigned us dry food again, which the cat has been eating 90% of the time for the past 5 years. Should we keep with the vets advice or would a low-carb wet food diet be better?