Well, I started believing certain aspects of evolution in High School, but wanted to believe in God so bad that I decided that Jehovah must have used evolution for all the species except humans. I still felt humans were special and that God existed.
It wasn't until my early 30's that I realized that I also believed in evolution of man. It wasn't until this year that I admitted to myself that it was more reasonable to admit you don't know something than to say it was God/Holy Spirit/Magic.
2.) Which person/source first made you reconsider your position on creationism?
When I learned TTATT, I decided that certain subjects weren't off limits to me any more. So I read some Richard Dawkins. Watched more science documentaries with an open mind. Evolution and Big Bang made much more rational sense than believing there was some magic or metaphysical force involved.
3.) How long a period of time did it take to fully convince you?
See above. It was gradual.
4.) What books and videos did you read and watch?
The Selfish Gene by Richard Dawkins.I also watched the debate between Dawkins and Cardinal Pell on QandA. (available on YouTube.)Still learning and gobbling up all I can about the subject.
5.) How much better do you think you understand biology is now vs. before?
I feel I have a real understanding of the world around me. I also feel comforted that it's okay to have unknowns. Unknowns eventually become knowns, even if it's not in your lifetime.