Most importantly, it's not hard to learn a new language, but you do want to make sure you learn and apply best practices.
Pickup a couple of those books maybe (also there are online versions of most of those available for free. I do like physical books, but that's just me), read them and practice every day.
https://www.amazon.com/JavaScript-JQuery-Interactive-Front-E...
https://developer.mozilla.org/en-US/docs/Learn/JavaScript
https://www.amazon.com/Eloquent-JavaScript-Modern-Introducti...
http://jstherightway.org/
Most importantly, it's not hard to learn a new language, but you do want to make sure you learn and apply best practices.
Pickup a couple of those books maybe (also there are online versions of most of those available for free. I do like physical books, but that's just me), read them and practice every day.