Second Guesses

I've come to realize that I second guess myself far too much. It's as if I don't trust myself or I don't think that I'm competent or intelligent, when my achievements admittedly indicate the opposite. Per usual, it's probably a self-esteem issue that somehow can be traced back to my father, but my main concern is how do I change it? They say that acknowledgment is the first step to recovery. OK, I've acknowledged that I should give myself more credit, but it's not an easy thing to do. I worry that when I finally do start going easier on myself, I'll start screwing up, possibly very seriously. When I finally let my guard down, I'm going to leave the hair straightener on and burn down the house or ruin an incredible opportunity for myself by being too negligent. I also do think that I have good reason to be so doubtful of my capabilities because I am a bit of a scatter brain and if it's not written on a Post-it or if it doesn't have an alarm set on my Blackberry, chances are I'll forget about it. On the other hand, I think using ical, iprocrastinate, Post-Its, AND my Blackberry is a bit of an overkill. So where is the middle ground here? I know it's probably a matter of trial and error, but I have an intense fear of the error aspect of that dichotomy.

*Sigh* Any suggestions?