Congratulations!!
Since you're stressing out, my advice to all brides to be:
No one remembers a "perfect" wedding other than to remember that it was quite lovely.
So embrace whatever goes wrong either in the planning or the day. Those are the things that will make your experience memorable for you and your guests. And if you are a good story teller, those stories just get better and better with a bit of embellishment over the years.
Several things didn't go according to plan for my wedding, and it's still a great memory to everyone who was there. Enjoy the planning and enjoy the day.