I wanted to start snacking way after I had already finished eating for the day. I was on my way to the kitchen and decided to stop off at my closet on the way to the kitchen. I tried on a pair of pants that USED to fit but are now too tight to wear. This was the incentive I needed and I resolved to not have a late night snack!
If you want to achieve your goal badly enough, you will not need 'will power', but 'want power'.