Completed PreCana but worried about saying my vows. Help

Hi, everyone.
I am so excited because my FH and I completed PreCana on Saturday. It was an all day class from 8:30 until 5pm and aftwards they invited us to 5 o'clock mass were they had all the couples go up on the alter, they blessed our engagement rings and they had the guys recite a poem to the girls. It was really nice but a little nerve wracking in front of all those people. I am little concerned how I am going to pull off my vows the day of the wedding when I was struggling to hold back tears and laughter (out of nervousness) during this ceremony.
Any suggestions?

I feel for all of you - I'm Greek Orthodox, and all my FI and I have to do is stand there for an hour.... We don't even have to say vows.

Any of you see My Big Fat Greek Wedding?

Welcome to my world!!!!!!!!!!!!!!!!!!!!!

I have the habit of laughing when I am nervous also. We are just going to say 'I Do' because of this. I wish I didn't have to, but I remember that I wanted to laugh up at the alter when my sister was saying her vows!!

There is no way I won't be sobbing! Especially after the emotional roller coaster we have been on lately.

Maybe I should call my florist and tell her to make some of the flowers in my bouquet out of tissues!