Your over your first hurdle. You actually want to stop, and you sound fairly serious about it. . .Your addicted to a drug more powerful than heroin, and you are not alone (about 25% of adults smoke). There is no magic secret, but here are a few tips.
Give up when the time is right. After a stressful day, nothing beats a pint and a fag. Overcoming this will take all your determination.
Try making a smoking diary. Identify "danger" times and habits. You can plan to change things around a little. (Remember you will be changing your life !)
Think about "craving management." Initially, cravings will be intense, frequent and long lasting. There will be periods in between when you feel normal. Try and find something to do during the craving, eg. walk, drink water, brush teeth, and tell yourself it will pass. Nothing will take the craving away, other than a fag though.
Eventually, the cravings become shorter, less frequent and less intense. Sometimes the odd one will try and trip you up. (eg when in the pub)
Talk to your GP re. NRT/ Zyban etc. Could help if you are determined. Careful if flying with zyban, may have to tell AME.
Try quitline on 0800 00 22 00
Good luck. Don't despair. You will do it eventually.