I gave up sugar, grains, and processed food two years ago. I went cold turkey and just increased my fat intake to compensate.
After a while, sweets, cake, and bread stopped looking like "food". Somehow my brain rewired to perceive, say, a chocolate bar in the same way it would perceive a wooden spoon or something else inedible.
What I did find was that one of the ways to reduce anything that felt like a craving was to take a spoonful of double cream. It had a really calming effect on my brain.
One thing I will say, though, is that I don't think you can do it and drink more than a few glasses of alcohol a week. I found drinking alcohol made me crave sugar and bread products. I can just about drink a pint of beer on a full stomach once a week, and be okay. Any more and it is a disaster.
Interestingly, there's a woman in the states that has been looking at the relationship between grain product consumption and alcoholism, and had a lot of success with treating alcoholics by putting them on grain and sugar-free diets. There seems to be some sort of connection.
What were the effects? I lost a hellova lot of weight very quickly. It was almost like a pound a day and I wasn't particularly big to begin with; I think I lost about two stone in three months.
Giving up sugar and grains gave me a lot of energy, and because you tend to replace those items with ones with more nutrition, I noticed other changes ... skin got better, hair grew faster, nails got stronger, my eyesight improved a bit.
For snacks, try nuts. My DH eats thin salamis, like a kabanos. Celery is a good one, particularly with cheese or a dip.
All that said, I feel a bit crap today because I've stopped drinking caffeine four days ago. Crikey, the headache ....