It definately can be hard to do. I had bought a new car and knew I wasn't going to be smoking for as long as I had the car so I never smoked in it. Breaking that habbit I think helped me a lot. Almost a year later my BF was ready to quit and so we did the nicotine patch. After 1 week I became very irritable and stopped those. I had wanted to quit for a couple years and hated the smell of it. Oh, we also used to smoke in our apartment and promised we would never smoke in it again whether we succeeded or not. I have been smoke free for almost 12 years now. I thought the hard part would be having a drink and not being able to fight off the urge but once I was done I was done.
There have been a few times where I really wanted one but I told myself the stress I was currently in wasn't worth having one. The times were a car accident, my MIL in the hospital, and my FIL and MIL passing. I didn't have one and am glad.
As for my BF, now DH, he didn't succeed 12 yrs ago and still smokes today. He promised he would before/when we got married and then before both kids came. He tried but not whole heartedly.
I don't recommend Chantix, yes it can work great for most but there are also side effects that can be worse than trying to quit on your own. My DH tried it and shortly there after he had high blood pressure. While it runs in his family, he didn't have it until after taking Chantix for a month or two.
For motivation, think of your kids, I don't know how old they are but our 3 1/2 year old is asking questions and is curious. I hope he is able to quit soon so they don't get to familiar with it. Once you are a non smoker again remember the smell of an ashtray, that is what your breath smells like, not so pretty.