If you have been drinking significant amounts of alcohol regularly for a long period of time, do NOT attempt to stop drinking without first talking to a doctor. When you suddenly stop taking a drug (such as alcohol), your body goes through a process called detoxification, or “detox” for short. Detoxing from alcohol can kill you, even though it is rare. This is not a joke or an exaggeration.
You should talk to a doctor before you do this. In fact, it’s always recommended to consult a doctor before you make a major life change, even if it’s starting an exercise program.
That said, a lot of people try to quit by themselves before they seek professional help.