Almost every major change I've made has been AFTER I realized that my initial decision not to make the change was based on fear. Once I realized that it was fear of the unknown that was holding me back, I went ahead with my decision. This has lead me to changing jobs, to going back to school, buying my house, etc.
If you fear change, I say go for it.
On the other hand, if, after much thinking on it, you decide that this change is not in your best interest, don't act on it. But don't let fear of the unknown, of change, hold you back.
You quit drinking. Anything after this should be cake!
Good luck.