How to remember to switch pronouns?

I have a classmate who just came out as trans, and while I don't know them very well, I'm worried about using the wrong pronoun, (not because I don't know what the correct one is, but because I might forget) because I always call people the wrong names and I don't want to be rude. Plus, he seemed really nervous, and I'd feel terrible if I made that worse.
Answers

J

Why would you be referring to someone by third person pronouns when they're right there?

Sasha Whitefur

Are they a transgirl?

reme_1

If you make a mistake, just excuse yourself. Don't make a big deal about it. Just quietly correct yourself.