Scared About Davids Bridal

Hi everyone...first of all good luck to you all with your weddings. I purchased my dress at davids and now I am scared about my alterations. I have been reading so many horror stories, but I hate to take my dress somewhere else. Has anyone had a bad experience at the Davids Bridal in the Pittsburgh area or could maybe make a suggestion to me (other then taking the dress some where else) to avoid any problems? Thanks !!