Diet plays a really important role on the journey to lifestyle change, but not only one. Significant factors are also physical activity, adequate sleep, hormonal balance and mental set.
My first advice is “buy a diary” that can be very helpful tool. You can write down tasks and achievements, your ideas and thoughts. See your thoughts on paper has a greater effect on consciousness than if you just keep them in mind.
You can try the diary for the first task INTROSPECTION.
Remember, losing weight is not easy, the process looks like: