Big difference between pro and amateur.

Do your homework. Why hire a professional photographer when Aunt Betty got the same camera for Christmas.
Well because you could end up like this couple
http://www.dailymail.co.uk/news/article-1218248/Newlyweds-win-court-battle-1-500-wedding-photographer-shoddy-pictures-include-missing-heads-car-close-ups.html

When looking around for a wedding photographer, experience is a must! Check out their work, testimonials, ask questions.
I know someof you are on a budget but some professionals can work with that budget.
This is one special day and you dont want to be upset in the end!