That's where code review can be such a valuable tool. I was learning Python coming from Ruby about a year ago and, sure, the languages are similar and it wasn't too hard to get started, but having code review sped up how quickly I became proficient by a lot. It's great having a bunch of people around you that can say things like "There's this thing that exists, don't do that." or "It's more idiomatic to do this that way instead of how you're doing it." or "People hate that because, do it like this.". It makes a huge difference.