I found that it was a matter of state of mind, I know that sounds trite but that's the way it was for me. The more I expected it to be awful the more stressed out and nasty I got. I figured it was an exercise in futility if I was going to look at it like that and instead of smoking the last 3 cigarettes I just shoved them on top of the fridge - no more tension from the waiting anyway.
Then I ate and chewed gum and ran about like Kojak with a lollipop in my mouth (excellent excuse for lollipops). The first bit was aggravating, you keep thinking about it but if you can find something to take your mind off it it's helpful.
After a week though its all about habit and not withdrawal. I just changed some things that I did - read a book at lunch at work so I wouldn't think about going outside for a smoke etc.
When it comes down to it though that was just me.. everyone is different I think. You honestly do have to want to do it though I can't imagine having made it if I didn't feel like it was time to quit. Hope this is the smallest bit helpful, good luck