The cognitive part is rational thinking which I'm sure you can get the hang of once you start and find your stride. I struggled with the behavioural part. It sounds like you have good self control and can set your own goals but I can understand how it would be difficult to stay motivated without a 'guide'. There is this DBT book which is mostly for BPD but there is a lot of CBT in there too, http://www.amazon.com/Dialectical-Be.../dp/1572245131
I worked through a fair amount and it was really helpful, until my psych told me that I was doing too much cognitive and not enough behavioural, haha. So it might be useful for you. This way you still have a guide, but you can work at your own pace and set your own goals. And we're all here for you to keep you motivated, and you know you have your therapist if you need a safety net. Sorry you had a bad day, hope you feel better soon.