I think the most successful quitters have let the ecig take away what it will during the first period of vaping and then gradually reduced the number of cigarettes they smoked. If you quit because you think you should instead of because you realize you dont need them, the urge to continue is stronger.
Let the vape take them away gradually and you probably won't have the desires to try them again. If you read my story, you know that I kept the coffee and after meal cigs for two years after starting to vape. It was when I found out I really didn't need them that I just quit. Could have done that a long time before I did, but didn't realize it.
Keep the pressure at a low level and don't worry about quitting them all at once. Ecigs will eventually get you there when you are ready.
I think there should be some pressure. If I put it off swearing off cigarettes for too long I would've likely found more places to slip one in.