I transitioned slowly into PB, by slowly eliminating grains, it took me some time while many others here in the forum went cold turkey from day one. If eating even small amount of carbs triggers cravings in you, then you might want to try going cold turkey. You need a lot of prep work before you do so - eliminate all junk and non-primal foods from your home and make sure you're well-stocked with primal foods and snacks. So whenever hunger pangs hit you, you have access to healthy foods. You'll get the low-carb-flu, symptoms of carbs withdrawal initially but if you just keep at it, you'll be fine in no time. Good luck.