For me the changed came out of necessity, after feeling the effects, I knew it was right. My friends advice was to just jump straight into it. Reason being it is not good to eat all that extra fat with a lot of carbs. Find something that you can prepare easily and eat, then build on that. Just reducing your carbs will make a huge difference, adding more fat will provide the missing energy and promote the production of ketones that will allow you to lose weight.