Everyone will tell you that it is normal to be nervous on your wedding day, but you do not have to let those jitters get the best of you. Envision the day.
Take some time with your future spouse before the big day, to make a little mental movie of how the wedding will unfold, from the ceremony to cocktail hour to reception. You will both be better prepared for the real thing, as if it is not a totally new experience.
Trust those around