In my opinion the most important part of a wedding is that it should be fun! It's a celebration of two people who have fallen in love and are becoming joined together forever. It's time to party!
Of course we all want a wedding that is beautiful and unique and special but when everyone is driving home that night they should be saying to each other, "that was a great day! What a fun wedding!"
That doesn't mean you need to hire a stand up comic as your officiant but you do need to keep thinks light. Don't let yourself get worked up if something doesn't go as completely as planned. This is your big day and your only job is to say "I do" and enjoy yourself.
I remember one beach wedding where a speed boat slowed right down several feet from shore and the passengers started yelling and waving. They weren't trying to ruin the wedding, they were simply having fun (and had probably been drinking a little too much!). It started to bother me because the noise of the boat motor and the yelling was distracting but the bride took it in stride and even waved and yelled back at them! Everyone in attendance laughed and shortly after the boat sped off and the ceremony continued.
It would have been very easy for the bride or groom to get upset and lose focus on what was really important but humour and a fun attitude won.
As I've mentioned before, as much as you plan in advance something WILL go wrong on your wedding day. Please don't give it a second thought. Wake up on your wedding day with the thought, "this is going to be a fun day" and hold fast to that mantra no matter what happens. When you think of your wedding day 10 years from now it should being a smile to your face and any little speed bumps that happened should be long forgotten memories. Remember, have fun!