Yes, they (glucometers)are extremely simple to use and they always come with instructions.
There are various makes and models but they all invariably consist of the following simple processes:
1. pricking your finger with a small needle-stick;
2.placing a drop of blood onto a testing strip;
3. Then placing the testing strip into a glucometer - which will give you a blood/glucose level reading;
Depending on what country/state you live in they can be picked up from your Doctor or local Diabetes nurse or bought over the counter at pharmacies.
You will have to talk to your primary Diabetes healthcare professional about what your parameters re, blood/glucose levels should be.