Start with the readiness diagnostic
The diagnostic is a short set of questions about what you are preparing for and what you already have on hand. It takes about two minutes, needs no account, and ends with a plain-language summary of where your evidence looks reasonably complete and where there are gaps worth filling before you talk to someone.
It is the right first step when you are not yet sure what "prepared" would even mean for your situation. It produces an organized starting point, not an assessment of your eligibility, diagnosis, or outcome.