Sue: It does sound like you are ready and you will be ok.
My ex husband's father was an alcoholic. He died at age 62 because he refused to adapt a healthy lifestyle. I used to be certain my H would "Wake up and see the light" but it didn't happen and if it does - it would be good for the kids but not for me. I have a much better life without him. He cheated us out of the family life we were supposed to have but ultimately he is cheating himself. His OW was just as bad - left a husband and son. She encourages his "right" to be himself. She just knows that if he sees the light - she loses her meal ticket. So be it. I just don't care anymore.
Good you have other role models for your daughter. I have a wonderful dad and brother and my own son is a fabulous dad replacement for my daughter.