The cutting phase is the most challenging diet for most people and I believe it is mostly a mental problem. Giving up those desserts, late night snacks and huge pasta dinners is hard and takes a ton of will power. Here are a couple of my tricks to help keep me motivated when I am temped to eat junk food. I keep pictures of myself when I look my best on competition day around and make sure that I see them several times a day, I think that this serves as a good self-motivator.
Another idea is to get rid of all the junk food out of the house, this is easy for me because my wife likes to eat healthy too. If you have a family to deal with that likes chips and pop, I would make them hide it from you. Another small trick is when you are hungry especially for sweets, go and brush your teeth or chew a piece of sugar free gum. I always hate to eat stuff right after I brush my teeth.