A good way to test, what you should do is to use a wedding budget calculator to decide how much each "feature" costs. Use this one if you haven't already found one:
http://jennlanedesign.com/wedding-budget-calculator.php
Not everyone goes to wedding planners. If you have a low budget, you could do the wedding yourself.
The first question should be the budget of wedding
The Production Budget for The Wedding Planner was $28,000,000.
The Production Budget for American Wedding was $55,000,000.
The Production Budget for The Wedding Crashers was $40,000,000.
The Production Budget for The Big Wedding was $32,500,000.
The Production Budget for The Wedding Date was $15,000,000.
Wedding invitations can range in price from 50 cents each to $25 each depending on how elaborate they are. On average, you should budget around $2-$3 per invitation between printing, envelopes and postage. Some invitation companies say that you should budget 10% of your entire wedding budget to invitations.
The Production Budget for My Best Friend's Wedding was $46,000,000.
Usually a planner charges based on the total budget of the wedding, say a % of the the whole budget. Sometimes they also qoute fixed based on what all you require him to do. So the scope of work matters for the qoute.
www.wedding.theknot.com is where you would find a wedding budget calculator that is easy to use. It will itemize the cost of your wedding based on budget, attendants and guests.
Ask your mother, or family member, they should be the ones you trust and should know.