The interview was an nerve-wracking experience.
My heart is pounding.
His heart was pounding with excitement.
shake in one's boots
I'm shaking in my boots.
Here we go.
I'm not quite good at singing and dancing, but anyway, here we go.
I'm totally freaking out.
A: This is nerve-wracking.
B: Relax. There's nothing to worry about. Thousands of airplanes fly millions of flights every year.
A: I've never flown before and my heart is pounding.
B: Everything will be fine. If you want to, you can hold my hand while we take off.
A: Thanks. How many flights have you been on?
B: None. This is my first.
A: You're so brave and I am shaking in my boots.
B: Not me. I think it's exciting. I can't wait until we're flying like a bird, high in the sky. Here we go, we're finally taking off.
A: Wow, this is fun, it's so fast. Awesome, we are flying.
B: Hold my hand. I'm totally freaking out. This is terrifying.