Avoid mirrors. Don't look down my body. If I look my own body, concentrate on clothes or products (if in the bathroom, thankfully I have strong myopia, so it isn't so much a problem as I don't really see my body that well...) and list ie. varieties of wool or soap brands. Avoid touching my breasts o waistline or hips.
Put on my binder. Get angry or sad. Cry. Sometimes I have panic attacks. Imagining myself being an asshole to the cispeople who have bodies I'd like to have or that I wouldn't like to have but wouldn't feel dysphoria in, telling them they are ugly as fuck. Self-harming. Watch movies. Music. Listening to music and singing. Stay in bed. Not moving. Running around, crying.
Read books. Trans* poetry and writings online, even those not from FTM.
It depends on the level of dysphoria. Usually I just avoid mirrors, avoid paying attention to my body, put on my binder, distract myself.