Planning a wedding is very stressful, especially if you want a large wedding with a sit-down dinner. The planning stage, making sure everything has been done and getting the invitations out on time all take a skilled person who can organize and accomplish these tasks. One great way I learned to accomplish all this was through delegation. Don't try to do it all on your own.
The key thing is to use professionals at every step of preparation. Our wedding was in NY and it was really great (at least I think so). We paid special attention to the event furniture rental (NYC) and it wasn't in vain. It's a year since we got married and our guests keep talking about our wedding and they have profile pics made at our marvelous photo zone.
If you delegate the preparation process to the professionals who have years of experience in this sphere, you will be less stressful on THE day and even if something goes wrong there will be people responsible for it and they will fix it immediately.
One more thing I want to point out - is to plan everything thoroughly, write everything down and visualise in details the wedding you want to have. Thus you will have more chances to make your dream come true.