Hello,
I will offer you a deal: if you send me all the files and information, i will start working right away, even though I am not selected as the service provider! After I am done, I will show you the job, and if you are happy, only if you are happy with the results, you can choose me as the service provider! If you don't like my job, you can just choose someone else to do it!
So I will do this prior to being selected. This way, I will have a mock-up (or the complete project) to show you before you decide to make a selection!
I think you can only win by doing this way, because, if you like my job, you will know exactly what you are paying for!
Looking forward to hearing from you!
Zdrenga