If you attend a church that is not (or as far as you can tell) affirming of transgender folks in their midst, Austen Hartke (AKA Austen Lionheart) has posted a great video on various ways of testing the water at your church. He has several wonderful ideas you can try to get a feel for just how sensitive a subject it is among others at your church, from the very subtle to having THE conversation with your Pastor (something I have some experience with myself).
So go check it out – I recommend you subscribe to his channel so you get notified when a new post is up (once a week.) He has very good material presented thoughtfully and in a very friendly, non-confrontational manner. You can’t help but like him.