There are remodeling contractors that use a business model called design/build. These are firms that will guide you through the design as well as execute the construction. To find one in your area, you can go to NAHB.org and go to the tab for find a remodeler. Put in your location. You could also google design/build remodelers in XX city (wherever you live) and some options should come up.

Good luck on your project.

Before talking to a designer you should have a general idea of what style you are looking for, also what items are 'must' and 'wants' in the bathroom. The contractor are mostly likely not trained in design and their concerns are finishing the job on time and on budget.