Good luck with the diet. I've lost 30 pounds since April following it. If you're serious about the diet, you must buy his paperback book "Dr Atkins New Diet Revolution". It gives you the the theory behind the diet and specifies which foods you can eat and how much. Basically, you do not have to measure portions. You eat a reasonable amount of the allowed foods (meat, fish, eggs, some leafy vegetables) and almost none of the restricted items (bread, rice, potatoes, fruit). You can do your shopping at the grocery, but if you like, you can buy special low-carb bread and tortillas, shakes, bars at some Health Food markets and some major chains with health food depts. I recommend the Atkins chocalate shakes (4 for $8) and bars for snacks. Breakfast is usually egg omelet with cheese and bacon or ham. Lunch is deli meat with cheese rolled in a tortilla, dinner is steak, chicken, pork loins, etc. Snacks include the shakes, bars, sugar-free jello with whipped cream, fried pork rinds, diet sodas. Since I've been on the diet for so long, I've added some carbs mostly in the form of fresh produce from my garden or fruit from the store.
The Atkins books (paperback and hardback "Diet for Like") have many good recipes. I like the stuffed chicken breast, meat balls, etc.
The first week is the hardest. Drink ice-water to help with any hunger pains and eat snacks very sparingly. After a few days, your metabolism adapts to life without carbs and you will (at least I did) feel great. I exercise a lot (martial arts and mountain hiking) and do just fine with very few carbs. I also need 3 hours less sleep a night because my energy levels are so much higher.
I won't claim the diet is for everyone, but this is the first diet I've been able to stick with any time. Low-fat/restricted calorie diets were too difficult for me. It helps if you have a roommate or spouse doing the diet with you.