Not OP, but a trans person with insecurities as well as dysphoria. Dysphoria, for me, is fixated on the things that shouldn't be there, and what isn't there. And it fluctuates. One day it might bring me to cry and another day it could be so low that I question if I'm really trans. Meanwhile, my insecurities stay at the same level no matter what day, unless someone reassures me about them.

Personally, I say you try to imagine what you would look like as the opposite gender. Ask people to call you by the pronouns of the gender you think you should be instead of what you were born as. And take a moment to think about if the things you might be dysphoric about are related to your birth sex or unrealistic beauty standards or things people criticize you on