You have to "prepare" yourself for one very simple reason - you do not want to diet, you do not like dieting, who does...
The thing is, do not think about it as of dieting. Just try to correct your daily routines bit by bit, until they become your new lifestyle.
As was mentioned above, prepare your meals, plan and schedule them.
Eat when you are hungry, not when you got nothing more to do. Drink more - you will feel less hungry. Make this a rule - whenever hungry, get a glass full of water. When I was working all day by the computer, I used to drink ALL THE TIME. I mean, every 2-3 minutes. This helped me a lot! I was not so hungry!
You can also drink grean tea - it helps.
Eat smaller portions, but more often.
Do not think of dieting as of something you hate - just "rename" it!! Start bit by bit and you will do that!