Same as stopping smoking I reckon mate.
When you know you have had enough you will stop, only you can be the judge of that.
As for sitting with a can in your hand, I do pretty much most of the time, it gets to be a habit and for the most part, a very nice one.
These Computer thing's don't help, they are time consuming when other more important stuff get's neglected, including loved one's and are a form of addiction themselves.
You know you've been a bit of a silly fecker so that is the hard part done.
Start getting up in the morning and watching the Sun come up, busy yourse