my one year quit anniversary is sometime next week (or so my partner says... i never really keep track of such things). my formula for success was:

a) accept that it's going to be difficult and ignore people who say it's easy.
b) use the patch
c) bike more
d) learn how to take breaks. one of the hardest things about quitting is not having a 7 minute micro-break every 90 minutes.
e) do not stress over weight gain. it will happen. let it. you can always shed pounds later