Tony winner and four-time Tony host Neil Patrick Harris guest-hosted on Jimmy Kimmel LIVE! December 6, and actor Armie Hammer was a guest.

There to discuss his recent movie Call Me by Your Name, Hammer recently announced he will be making his Broadway debut in summer 2018 in Straight White Men, directed by Anna D. Shapiro. But Hammer revealed to Harris that this is also his stage debut—he has never acted onstage in front of an audience.

“I need pointers. I’ve never done this before,” Hammer confessed. “It’s an amazing opportunity, and I have no idea what I’m doing onstage.”

“I think the great thing about a play and the great thing about theatre is that everyone watches it and lives it from A to Z all the way through. So you will get caught up in it,” said Harris, “and the one piece of advice I would probably give is to be very careful and protective of your voice. I’ve done musicals before where you have to be careful of your voice, but a lot of people go and start shouting in a play not realizing that they need to shout almost as if they’re singing… doing that eight times a week and getting intense, and suddenly two months later you’re totally hoarse and have you to keep doing it and you can hurt your chords. So pay attention to your throat.”

Written by Young Jean Lee, Straight White Men is about “the concept of toxic masculinity and what it is to be a straight white male and the things that are expected of you from that,” according to Hammer. Watch the video above for their full interview.

Hammer’s on-screen co-star Timothée Chalamet joined the conversation. The young actor was recently named the Breakthrhough Actor of the Year by the Gotham Independent Film Awards. Having made a splash Off-Broadway in Manhattan Theatre Club’s Prodigal Son by John Patrick Shanley, Chalamet can now be seen in Call Me By Your Name and Lady Bird opposite Saoirse Ronan. Watch the interview below.