The hardest part of doing any high protein/low carb diet is that "snacks" (or meals) aren't readily available. I found I'm so used to just grabbing a handful of chips, making a bagel/piece of toast, or pouring a bowl of cereal when I need a snack/quick meal, and you can't make "quick" snacks if you have to cook a protein. Make sure you plan ahead and have plenty of hard boiled eggs, cheese sticks, sliced meat, etc., on hand for these "need it now" occasions.
i'm a big fan of the south beach diet. even when dh and I aren't actively dieting ALLOT of their recipes are a part of our normal rotation of meals just because we enjoy them so much.
as for having quick meals available-with south beach most of the recipes are set up for 4 servings so we routinely eat 2 (or if he's not participating i'll half the recipe and just eat 1/2) then container up the second to go into the freezer. most flash defrost and reheat really well (the greek sloppy joe and the chicken crimini in particular). we will also make larger batches of some recipes and set up quick meals to freeze for the nights we know we are busy. tonight for example we are taking a small pork loin and cooking it with south beach's bolivian spiced pork chop recipe. we will have our meal and then break the remainder of the loin into sections to freeze in order to pull out other nights. when we make the greek sloppy joe I often double the recipe to make lunch size servings (I look to how many calories are indicated in an average lunch to make adjustments to the serving size).
with snacks I agree if you can have stuff on hand or somewhat pre-prepped it really helps out. I make small containers of south beach's cilantro mayo for their lettuce wraps, and always have a container of their recipe for pesto for a quick pesto tomato.