In my story
Dream Life, there are two characters. One of them is smart, the other is not so smart. I've recently found it really hard to write about Tyrone and from his perspective because he lacks some (a lot) of the knowledge I have and uses dumb down words that I don't really use much anymore. And a lot of slang that I've retired. Unlike Ja'trell, who uses advanced words and is similar to me in ways. Tyrone is nothing like me so sometimes I have to catch myself when I start writing a word that his character wouldn't think or say and sometimes I have to step outside of my comfort zone and write something I'm not a fan of writing too much. Like when it comes to the way he has sex and talks about people. It's not something I would think, say, or do even if I was a boy. Also I feel weird when writing about how attractive a girl looks to either of them because quite frankly, I don't look at girls like that and I don't find them that attractive.
Then it's difficult to write about Ja'trell because he doesn't smile much and I smile nonstop. It's not too hard though, but it feels weird for me to leave out the "I smile" so much when I feel like I've reached a moment where he should smile.
I guess writing about characters that have an opposing character than you, as an individual.
Also writing in present tense can get difficult because I'm so used to thinking in past tense when writing stories although as I'm writing, it's supposed to be happening at
that time.