Starting a hydraulic engineering consulting firm

Hi everybody,

I'm going to start a hydraulic consulting engineering firm in a month by myself. I would like to start design for architecture consulting firm and when I will grow sufficiently carry hydraulic works (water distribution, sewage network...).

I learned a lot about the subject but one of my unsovable problems is this one:
Since I obtained my degree ( 2 years ago) I only worked in operation and maintenance. Even if I learned design through books and courses I don't have any experience in this field.
How can I convince potential clients that I can do the job ?
Should I decrease my fees to get clients ?

My personnal situation don't allow me to work as an employee. If I could I would work for a consulting firm to get some experience.

Thank you in advance for your advices !