For me, quitting drinking came in stages. I got to the point where the pain I was going through because of drinking was so great, and I got so tired of it that it created a determination in me to do something about it. That determination (willpower) helped me get through the withdrawals, etc. But that willpower only got me so far. Eventually, I knew I needed outside support if I was to remain sober, because willpower is based on bad memories and that eventually fades. I also had to be proactive and build a sober life because I needed a reason to remain sober besides not going back to the hell I was living in.
This has worked for me, but everybody finds their own path. Good Luck. John