Welcome to FDMB Katrina and Zoe! Deidre (Jerry Dutchboy) already provided information that will get you started here, so members can jump in with suggestions and support.
Here's where you will find the spreadsheet instructions and also helpful documentation on understanding the spreadsheet grid:
http://www.felinediabetes.com/FDMB/forums/suggestions-tech-support-testing-area.6/
If you are testing already, you should always test before every injection to be sure it's safe to do so. Then if you get tests in at different times of the day on different days, as well as a before bed test at night, that is going to give you the same information over the course of days as a curve. Sometimes testing every 2 hours for 12 hours doesn't always work out well. You are right to be concerned that the 2 Units starting dose might be too high. A one time test at the vet for diagnostic purposes can be elevated due to travel and vetty stress, as much as 100 points.
Recommendations here are to begin at 1 Unit, test and see how the dose is affecting the cat. Visit the
Lantus forum and begin reading the yellow tagged sticky notes at the top of the forum.
Diet is very important in effective diabetic care, and going forward we can offer suggestions to get Zoe on a low carb wet diet. Please post in the
Main Health forum so that more members can meet you and Zoe, and address whatever questions, concerns and issues you have. This Intro forum is only the welcome mat and is not as heavily monitored.
Best wishes and looking forward to Zoe's progress on this new journey.