If you can learn to test, you won't need to take Bogey in for curves, which cost money and can be stressful for the cat. Stress can raise sugar levels, too, so tests at the vet may not be as accurate as what you can do at home. If I had to do this all over again, I would start with analyzing the food. What are you currently feeding and how often? Many people here feed Fancy Feast Classic and Friskies Pate varieties for lower cost. Don't let the vet talk you into prescription foods. If possible, feed smaller meals throughout the day vs 1 or 2 larger meals at shot times. This can help the pancreas and manage food spikes more effectively.
Hang in there! There's a lot to learn!