I agree with mandalinn. I think the first thing is to ask yourself if you are an "all or nothing, has to be cold turkey, can't have it in the house or I'll snarf it all down" type or an "I can be content with a smaller portion and won't be tempted to snarf the whole box down" type.
Either way, it comes down to substitution and exploring your options.
If you absolutely can't have the snack food around without devouring it all at once, can you come up with better choices to substitute for it...something that is healthier or less caloric but that you really like so eventually you won't miss the other stuff?
I'm the other type. I love salty snacks and knew I couldn't go cold turkey or I wouldn't have made it this far. So I did a couple of things. I stopped buying cans of Pringles (which I loved) and I started buying junk snacks that I liked (but not loved with a passion, lol), bought 100-calorie-pack items, bought stuff that I could divvy up in smaller portions. I had never bought a 100-calorie pack of anything before 2007. Actually, last year, I began eating a lot of foods I had never bought before or hadn't been eating that much: soy milk, Special K with red berries, Laughing Cow cheese wedges (OMG...they satisfy my craving for cheese and they're only 35 cals a wedge...2 wedges and I'm good, lol), more fruits (bananas and oranges esp.), turkey slices, instant oatmeal....and I love this stuff, lol. Seriously, I noticed stuff in the supermarket I had totally ignored before!
I think it's easier to wean yourself away from stuff, or cut it down, if you've found a better option to replace it, either quality-wise or quantity-wise. I mean, I'd been going into McDonald's fairly often before and I haven't set foot in one in over a year. I may still be tempted if you stuck a cheeseburger and fries under my nose but I'm not craving it or thinking about it. I like the "new foods" I've found. And the kicker, besides losing the weight, is that my cholesterol went from 150, which I'd been averaging for years, to 112.