This has to be the most counterproductive advice I've ever heard. You need to start speaking as soon as possible. There's no other trick to learning a language than forcing yourself to speak.
For some it's easier because they're less socially anxious. For others it will be more difficult. I was in the latter camp learning Danish. You have to make friends with your fear or you will forever be stuck in what many language learners refer to as a "quiet period". I was for a decade (!!!) If you don't start speaking you will forever have only an intellectual understanding of the language.
So speak. Please speak. Early and often. Babies sound things out early because they're trying to get a hold of it, the vocal contortions required.