Like everyone has said, it is almost impossible to do alone, at least for me anyway. I tried for almost 4 years to try and quit, I would do ok for a few weeks, even months....but was not at all happy and just could not understand anything going on in my life. I finally gave in, lost my big ego thinking I was strong enough to do it on my own and went to my first aa meeting 3 weeks ago. I know it's not the complete answer, and it will take alot of work from me, but I have accomplished more in these 3 weeks going to meetings, getting support, and not trying to do it alone anymore, than I have accomplished in the 4 years going at it alone.
So keep reading and posting. Go to a meeting. It will help more than you think!!! Good luck!