I'm a girl. How on earth do I intend to write a guy's POV without doing one of this?

-Making research.

-Reading books that have boys' POVs.

-Watching movies with a prominent male lead.

-Interviewing a guy that acts like your character.

-Practicing before time.

However, I strongly advise you to stick to the POV you're most comfortable with for the most part of the book.