PPL

I recently did my discovery flight and seriously considering a career with the airlines one day. My instructor was serious about it but what is the work like? He was telling me it’s a ton of stuff and you’re gonna have to read a bunch of books for it. (I’m terrible with homework because I procrastinate). So my question to yall is how exhausting is it? I’ve heard from other pilots that it’s mostly easy concepts it’s just a lot to learn. What’s your opinions?