Glad to see you are getting some great help from great people and are absorbing some of the information. We used Lantus with my Smokey girl. Here is what our time line looked like.
12/21/09 - DXed vet tested @459
12/28 - started 1U Lantus b.i.d. ; transitioning to dry Purina DM, with some soft DM
1/4 (?) - raised to 2U vet tested @352 at nadir (6 hours after am shot)
1/11 - raised to 3U vet tested @ 225 at nadir
We continue with weekly checks at the vet, freefeeding the dry DM with am and pm meals of the wet DM, but all the cats are starting to dislike the wet DM so the majority of diet is the dry DM
02/01 - vet tested at 103 and holding 3U dose and moves to 2 week checkups, we are getting a bit nervous with the dose level but she is feeling healthy again
2/16 - vet tested at 83 and vet wants to hold the dose and go to a month checkup. Husband refuses to go that long without checking again with her numbers dropping and each time and the insulin that high, someone refer me to FDMB
2/21 is our first home test. OMG is all I can say, poor Smokey. But we still give the vet's dose of 3U after a 77. I think I was just reading and not posting yet so maybe I didn't get a butt chewing for that one :shock: (We have removed the hard food, feeding only soft, no more DM - all FF, ProPlan, Wellness, Friskies, Whiskas, whatever their picky butts desire this day)
2/24 the first test after am shot is 52, call vet worried about possible hypo, evening shot is skipped, dose lowed to 2U going forward.
3/2 dose lowered to 1U
3/9 dose to 0.5
3/16 dose to 0.25
3/23 dose to drops
3/29 last shot of insulin
Barely over a month from our first home test and diet chnge to the last shot and we were a pretty slow step off. I think they liked torturing us

as many may have looked at the numbers and said a newbie under 200 shouldn't shoot at all and we may have never given another shot the day I showed up here. But Lantus is a wonderul healing insulin. It is a long term, gentle insulin that allows the pancreas to heal while it holds those sugars low until the kitty can produce the insulin on its own.
I would recommend taking the advice you get here. They have so much joint experience with Lantus on this board. Hometesting can't be stessed enough. The power over what you are doing that you will gain when you actually know what is going on is amazing and also so comforting.