I did a small, but traditional wedding, at a little chapel. Planned it myself, too! That's crazy nightmare material right there. I barely slept.
I never really got cold feet... I knew Justin was the right one.
I was excited, nervous, but most of all, happy. A lot goes into that day, so I believe all sorts of high emotions are normal. Then it flies right by!
As the change - well, it was the first relationship I was in where the "in love" stage passed, I wasn't sure what to do there. Learned how to better read and demonstrate love expressions change, had a baby, and am honestly happier than I've ever been. I love my little family.
Good luck! Don't freak out too much! Deep breaths... ;)