Stop Smoking

So I have a plan to quit smoking.  My quit date is Sunday, as in Saturday night will be my last cigarette.  I have been reading a program that I really enjoy and it makes a lot of sense, but I am still getting really anxious about it.  I have tried to quit in the past and have had major anxiety attacks.  I am feeling much more confident now, but that anxiety is in the back of my head.  Not 100% sure I am going to be able to do this and really don't want to fall into a funk if it starts getting bad.  I am just gonna take it a day at a time and see what happens.  Yesterday I was feeling really great about it all, but today I can feel the anxiety creeping in.  Very scary!