Visit the feline diabetes message board. www.felinediabetes.com.
Most people on the list home test with Elite glucometers as it and
several other brands use the "sippy" strips to draw the blood.
There's a video on how to draw blood from the ear. Real easy to do.
The motto at the fdmb is "start low, go slow" meaning start out with
low doses of insulin and work your way up. If you start with too
high a dose your cat can hypo on you. Some people are also using an
oral med called Glipizide.
Please check out the site. You'll be amazed at how much you'll learn
from the folks over there.