Always take into account the season you are planning to marry in,time of day and whether it is hosted inside or out.
Consider the theme and style of your Wedding.
Look at Colour schemes that will suit both you and your bridesmaids.
Don't pick your gown to early. Six to nine months is great.
Make appointments and shop around.
Take someone with you who will give you an honest opinion and don't forget that camera so you can look back and compare which is your favourite.
Ask for samples of the material so you can make sure your accessories match perfectly! Once you have decided on your dress make sure you have all quotes in writing and alterations are included in the price.
Have a final fitting as close to your wedding day as possible so your gown is a perfect fit for your big day.