'Contestation de Loyer Initial': how does it work?

Good morning.

I am about to start a "Contestation de Loyer Initial" in the canton of Vaud.

Did anyone go through it before and can tell me how will it work?

In particular, I asked several questions to Asloca, but they did not reply to a specific one:

* The moment I send this complaint, will this be evaluated by the cantonal authorities, or will it go directly to the house owner?

The reason is that the lawyer himself couldn't tell me if I should or should not start this practice, and I am afraid of "pissing off" the owner if the request ends up being unloyal.

Thank you!