• It is legal to be dressed opposite to your genital sex [OGS], the exceptions being if criminal impersonation or intent to defraud is perceived.  Strictly speaking, the law states that persons with a penis use a mens' public rest room, those without use a womens' rest room.  This is supposedly true until SRS (sex reassignment surgery), or until the sex is changed on your driver's license. However, if dressed OGS, it's quite likely that using a public rest room OGS will cause the least disruption; be friendly and be quick!
• If you are incarcerated while dressed OGS, the interpretation above will be used unless you have documentation to the contrary (see below);  even then, situations can be at the discretion of the governing official(s).
• If pulled over by a traffic officer when dressed OGS, never lie to or hassle them;  explain that you are a transgendered person if your license and appearance are questioned.  If caught in situations such as the above, it's strongly recommended to have in your possession a letter from a psychologist stating that you are under their care for a transgender condition, and should be treated as your preferred gender.  If you have legally changed your name, keep a copy of the change decree in your possession.

(1) Pay a visit to your local county court house; obtain the forms for an Adult Name Change from the clerk, fill them out and pay the associated fee.
(2) In about a week you will receive the paperwork needed for posting a legal name change notice in your local paper; it must be posted for three successive days.
(3) If the paper provides a statement of publication with clipping copies, bring it to the courthouse clerk; if not, bring the actual clippings. Pay yet another fee; the clerk will then give you the legal name change decree documentation.
(4) Make plenty of copies---you may need several notarized copies for work, financial affairs, etc.

(1) Obtain a letter from a doctor (MD) stating that you are intending to have sex reassignment surgery (SRS).
(2) Bring this letter, your existing license, and a copy of the name change decree (above) to the Department of Motor Vehicles, presenting the way you wish your picture to show you.