I quote the speech:
"...But I’ve never felt more pressured than I ever have in my life, than over the last couple of months. Picking out this outfit — O.K., girls, I get it! [Laughter.] You’ve got to get the shoes, the hair, the makeup, the whole process — it was exhausting. And next, the fashion police — please be kind on me, I’m new at this."
"Read Caitlyn Jenner's Full Speech at the ESPYs." Time. Time. Web. 3 Aug. 2015.
"I'm new at this"?! Really? Did this person wake up one day and decided to go this way for whatever reason (15mins)?
Because It wouldn't be new if this person was practicing this lifestyle in private for a long time. So it is a possibility that this was a sudden decision, but why?