I have been hiring for 13 years, and have the same issues as the OP. I am always well groomed, well dressed, polite, and friendly. I never disclose my age or weight, and neither do I disclose my profession, or domestic situation prior to meeting, nor have I ever provided a photograph or deposit. I have always hired young, attractive guys, and I have never been declined. My sincere delight in my hire's youth and beauty becomes evident in our playtime, and memories of the experiences bolster my self-image.
My thoughts: be confident, and have the requested payment on hand. I think very few guys will refuse you. And have fun!