Comment by runarberg

A Japanese learner here (not commenting on this platform). I do recommend start using your target language script as soon as possible, maybe even earlier. The only exception are ideograms where you have to learn like 2000 unique characters, and even then you should learn the most common ones and start using them immediately.

Reading in a non-familiar script becomes much easier the more you do it, and the longer you put off learning it, the more opportunities you miss for using it.

I think you should only be using the latinized scripts in the absolute beginning where you are learning the most basic words and phrases like: “hello”, “yes”, and “no”, and “what is your name?”. This should only be for your first couple of weeks. After that you should have learned to read new words in the new script (albeit slowly). Learning the script makes everything much easier afterwards.