The bad news...No carbs? What do you mean, no carbs? To be fair, eating zero carbs is nearly impossible without resorting to extreme measures. That said, if you're doing it right, most of your carbs will be coming from green vegetables. That's right, spinach has carbs. Not many, but if your goal is a maximum of 30 grams per day -- and yes that is your goal -- they add up pretty quickly.
The good news...
It really is easier than it sounds. The first week will require some willpower, but after that sticking to the one rule should be mostly an issue of keeping the sugar pushers at bay. Repeatedly explaining to people that they're not helping by offering whole grain bread and sugared-up low-fat alternatives can be more harrowing than resisting strolling down the cookie aisle at the supermarket.
Here it is...
One simple rule: Don't eat sugary foods!
What is a "sugary" food? It's anything that you would think of as sweet, starchy (starch is basically sugar by another name), or glutenous* (anything containing grain or flour).
You can do it!
*Gluten itself is actually a protein, I'm describing the general class of food products. Most gluten-free products will contain just as many carbs as their traditionally prepared counterparts. It's the grain that you're really trying to avoid.