Some key points:
Some have no trouble at all, but some do and don't know what to do, so I'm just throwing these out there.
Don't be afraid to eat MORE if you are truly hungry and the calories just aren't there.
Get salt if your BP gets low or your heart rate starts climbing. You are dumping salt like mad the first few weeks of this.
Don't be afraid to eat a lot more meat than you think you should. I can easily eat two pounds of meat a day, usually more like one. Doing this two years and the best breakthrough I've made was increasing my protein! Burned fat and added muscle, have a better mood, etc.
Really get ready to embrace animal fat as a source of calories. Decent, chemical-free bacon is a key ally for most. Tallow is my favorite!
Seafood and organ meats will likely give you more spunk and energy than just steaks and chicken legs. Seaweed and shellfish especially come to mind, for their amazing nutritional profiles and traces of iodine. Seek out liver. Eat it somewhat regularly until your body tells you to stop, which it very well might after a month of loading up any missing vitamins in your body. I ate it twice a week for over a month before my body said to slow down on it. Chicken liver has a mild flavor - but I like beef liver better, it gives me more energy.
Don't bow to the sweet potato gallery until you're sure you are well-fat adapted. It took me SIX WEEKS to learn how to digest fat in large quantities. I mean, the squirts were normal at first until I dialed the fat back and increased gradually. But now I get 60%-70% of daily calories from fat easily and it all digests.
And if you have any trouble, plenty of people here have probably shared common experiences and can help you.