I had one regret that day, and it was that I would have scheduled the ceremony for an hour earlier because I thought there wouldnt be enough time to get good pics. However, now that I have my pro pics back, I dont regret that anymore because we had more than enough time and got some really awesome shots. Other than that, everything went as planned!
I will also say to get a videographer. I booked one and DH thought it was a waste of money, but when we were on our honeymoon and discussing the wedding he said that he was SO happy I got one because the day goes by so fast and he couldnt wait to relive some moments by watching the video.
I would randomly look at people (mostly my MOH and DH) and say to myself, this is my wedding day. It really helped me to sit back and take everything in!