Hi and welcome.
I am here in Victoria

I am Sweetgrass, otherwise known as Kimmee.
it looks like you are trying to form a plan you can feel comfortable with while you learn more on your crash course to Feline diabetes.
If I may add to what has been said, perhaps a goals list is a good start.
Since your sweeter than sweet furry is not yet on insulin, now is a great time to change the diet to wet food, lower carb.
so first off, while you are reading through the faqs..
http://www.felinediabetes.com/fdmb-faq.htm
1 -change diet to low carb before starting insulin. more info here...
http://www.catinfo.org/
we gave fancy feast grilled chicken feast ( no gravies ) and tuna
ketone testing during this quick changeover is important, you don;t want to hold off insulin if ketones are present at all
then, learn how to hometest, we used an ascencia contour, and were very happy with it..
2 -hometest ( you have been given those inks yes )
ideally hometesting and diet change will happen at same time so you can note the difference from "before" change to "after" change
3 -second opinion?
your vet sounds a little outdated in his thinking, perhaps calling around and seeing if there is a feline specialist with experience with feine diabetes may be the next step? if not, lots of vets are open to learning and hey, he did give you lantus...yay... so read and educate yourself and then share stuff, as gently as you can.
4 -insulin
Should the levels remain higher than normal, ( normal is about 60-120 ) or as we read in Canada 4-7 then a gentle starting dose and check in at the lantus insulin support group would be what I encourage. gentle is much less than 3 units and more like 1 unit, depending on levels, and your hometesting will show you.
So a shopping list...
-meter, lancets, ketodistix ( for testing for ketones) and chocolate ( for you

)
-low carb canned food, many samples to tempt your baby, with janet and binky's charts in hand...
http://www.felinediabetes.com/diabetic-cat-diets.htm
a vet you can work with who is on board
first tip off *vet offices should not be running a 24 hour curve....hometesting shows the levels without the added vet stress.
How does that sound? any questions?
Do you all have snow now?

Kimmee