Hello Paula,
In an earlier post you mentioned that you had
Quote"an appointment to see a Licensed Clinical Psychologist Specializing in sexual identity issues"
Have you been to this appointment yet? You seem to rushing ahead without making sure that is the right thing to do. Painting piggies, and pink panties does not mean that your wife will support you transitioining to a female, she may be taking this as a little bit of fun to spice up the marriage. You yourself said that you only thought that she was "Bi"
As Kendra mentioned there is always one way to find out and that she will either support you or she won't. But before you make any moves, be sure you are aware of the possible consequences, and that you are willing to accept them. Remember you have been together for 23 years.
I don't wish to rain on your parade but personally I would wait until you have seen your therapist, and after a few sessions see where you stand and if your mind is still the same. I would hate to see you make a horrible mistake that you would regret for the rest of your life.
Be patient Hun, another short wait for therapy won't be too hard to handle.
Take care,
Steph