My husband used to work in a band with a drummer with a drummer who sang a lot of lead. Great drummer, great singer. And yes, it’s hard.
My husband is a lead guitar player. Damn fine one, too. And a damn good singer. He has trouble singing and playing at the same time. He’s been doing this for over 30 years, and it still gives him grief. He ususally backs down from the more complicated lead stuff when he’s singing.