I'm pre-op and am treated as female just about everywhere I go.
For those who know I'm trans (my family, my church, my coworkers, my friends), the issue of "passing" isn't even something I consider. They know, and they will always know.
But among those who don't know (cafes, restaurants, stores, public transit) yet address me as "miss" and "ma'am," I often wonder if I'm really passing or if they're just humoring the presentation.
At this point, I've decided that it doesn't really matter to me if I pass or they're humoring me, so long as they address me properly. Whether or not I'll continue to feel this way as time goes on remains to be seen.