I can't answer your questions about the specifics of US laws cause I don't live in the states, but I am pretty sure there are still states where you need to have genital surgery to change your marker. As for the "legal" wait for your letters, there technically isn't a minimum, it's about when you're psychologically, socially and physically ready to have the surgery. I honestly don't think srs is something you want to be rushing towards. Based on your earlier posts I think you would agree when I say, you have a long road ahead. Your first step should be therapy. You've mentioned you suffer from a Bi-polar disorder. I remember it was only a few months ago you told us all that your thrown all your clothes away and moved away from San fransico. I don't think you should be even considering surgery yet.