Hire a Certified Wedding Consultant who will help you establish and maintain a budget and knows the cost-effective ways to plan your wedding for the best values. The Consultant will also help you to avoid those costly mistakes.
Hire a wedding coordinator. They will help you to get the right venders for your budget so you get the most out of your wedding dollar. Many times you can also get discounts from venders because the coordinator is giving them repetitive business.
ALWAYS set a clear, realistic budget for every aspect of your wedding. No matter how tempting it might be to deviate from it, DON'T. If you find that you have to make adjustments, then do so, by moving some of the allotted budget from one category to another. Stick to your budget, and work within your budget.