I'm not the best qualified to answer this question as I do spend a lot of time reading about programming languages in general, and even though I was able to grasp Rust's async/await very fast, I probably owe it to previous knowledge of a relatively large variety of programming paradigms. I'll thus rely on other commenters that seem to agree that it's really not as hard as you would expect. In particular Rust helps a lot in making sure you don't make too many mistakes so I'd wager that learning to do correct async/await in Rust is probably easier than in, say, Javascript.