It is very important to monitor your blood sugar while using insulin. How often you monitor your blood sugar will be determined by your provider. Be sure to keep a logbook of your readings, and share it with your provider at your appointments.
There are two different kinds of meters: a standard blood glucose meter and a continuous glucose monitor (CGM). With the standard meters, you will prick your finger to get a drop of blood. That drop will be placed on the test strip, which is inserted into the machine. The machine will give you a current reading of your blood sugar levels. You will have to repeat this process several times a day to get readings.
With a CGM, you will apply a sensor to your body that is worn at all times. This sensor will gather readings every few minutes and relay that information to your phone or a receiver. If you wear a CGM, you will also have to have a standard meter available for backup.
It is also important to regularly monitor your supply of insulin, needles, alcohol swabs, test strips, and lancets so that you do not run out. Also, keep track of expiration dates so that you do not use expired products.