Welcome to the site.
Sue mentioned home testing and I think you will feel more in control when you see the numbers and know how the insulin is working or not working. It helps so much when you know what your cat's BG was when you gave the shot and then had to leave for work. The testing helps you know if you should adjust the dose or even if you should give a shot at all.
Many people work, I am gone Mon to Fri for most of the 12hrs between am and pm shots, and some have crazy work hours or shifts so I am sure some can help you with a plan that will work for you, your cat, and using Lantus. If you can reply with the hours that you are working or away, the others will be able to suggest a plan for you. For Lantus, we know it's best for shots to be every 12hours, but sometimes life has a way of happening, and we need to make adjustments. Don't worry about your schedule; where there's a will, there's a way. It CAN be done.
Lantus is a good insulin; I am sure you will see results in the way of improvements to your cat's ways soon. What dose did your vet advise to give?
Here are the links to the stickys in the Lantus group that will help you understand this insulin, how it works and the protocol followed by most others:
Tight Regulation Protocol
LANTUS & LEVEMIR – INSULIN DEPOT –AKA- STORAGE SHED
Lantus&Levemir – Data Ready to Shoot Low Numbers
Sometimes the numbers go very low, so it's good to know the signs and what to do about it for your cat:
List of Hypo symptoms
How to treat HYPOS – They can kill! Print this out!
Jojo’s HYPO TOOLKIT
I know it's alot to get thrown at you in the beginning, but in next to no time, you will have it all down pat, and you will be helping the other new guys to come along here.
If you have any questions at all, please ask. There is always someone around to help.