Repeating what Soberlicious said for emphasis. You have been through the AVRT deal before and found it a bargain. You already know how fearing failure and having self doubt fit into the AVRT framework. If you are going to use AVRT for quitting tobacco, then you'd best get at it and toss that doubt into the same pile of garbage where the thoughts of smoking ever again sit, twisting hankies and whining pitifully.
Are you aware that you are 100% badass? You already know what to do here and that you will succeed, so let me offer congratulations in advance because I am confident in you too. Well Done!