If you want to be confident about the work is done right, then you should hire someone with the designation.
But often times a licensed contractor will able to help you with your remodeling needs too. Just make sure they are boned and insured. And part of the 75214 area is historial area, so just make sure you go thru the city to get proper permit prior to the remodeling start. Otherwise the city has the right to shut down the projects until proper permits are issued.
If you get a good architect and aren't doing anything really crazy, I would think one person can do it all. It probably depends on how much money you want to spend and perhaps if you're putting in a commercial kitchen.